WO2023286744A1 - 光学積層体、偏光レンズ及びアイウェア - Google Patents
光学積層体、偏光レンズ及びアイウェア Download PDFInfo
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- WO2023286744A1 WO2023286744A1 PCT/JP2022/027298 JP2022027298W WO2023286744A1 WO 2023286744 A1 WO2023286744 A1 WO 2023286744A1 JP 2022027298 W JP2022027298 W JP 2022027298W WO 2023286744 A1 WO2023286744 A1 WO 2023286744A1
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- light
- polarizing element
- reflecting layer
- group
- emitting
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/12—Polarisers
Definitions
- the present invention relates to an optical laminate, and polarized lenses and eyewear (sunglasses, goggles, helmet visors, etc.) using the same.
- Eyewear (sunglasses, goggles, visors, etc.) is used to reduce the glare caused by reflected light from water surfaces, road surfaces, snow surfaces, etc.
- reflected light from water and snow surfaces has the property of being polarized.
- sunglasses with polarizing function hereinafter also referred to as “polarizing sunglasses” or “sunglasses with polarizing function" are designed to effectively absorb reflected light that is polarized light. It is known that glare can be reduced and visibility can be improved without significantly reducing the amount of incident light.
- the optical film used for polarized sunglasses usually has a structure in which a polarizing element is sandwiched between support materials such as polycarbonate. Polarized sunglasses can be produced by processing such an optical film into a desired shape and fitting it into a frame.
- a polarizing element (hereinafter also referred to as a "non-light-emitting polarizing element”) is a film in which a so-called dichroic dye such as a dichroic dye or a polyiodine-polyvinyl alcohol (PVA) complex is uniaxially oriented together with a polymer such as PVA.
- a polarizing element with various colors can be obtained depending on the color of the dye used.
- Patent Literature 1 discloses that a luminescence polarizing element that contains a luminescence dye material and is stretched imparts new functions and designs to eyewear.
- the luminous polarizing element can be used in combination with a non-luminous polarizing element to impart new functionality such as luminescence and design without impairing the anti-glare function of the polarized sunglasses themselves.
- the luminous property is exhibited by irradiation with ultraviolet light, and for example, it is possible to impart a unique design property such as changing the appearance color tone of the eyewear outdoors where it is exposed to sunlight including ultraviolet light and indoors where it is not exposed. .
- Patent Document 2 in order to improve the design and visibility of eyewear, there is known a technique of imparting luster to lenses using a metal deposition film, a liquid crystalline material, or the like.
- the light emission polarizing element that has dichroism and can obtain color tone selectivity and sufficient light emission
- a light reflecting layer such as a metal deposition film or a liquid crystal film can express various reflected colors, the color cannot be changed indoors or outdoors.
- eyewear typified by sunglasses can achieve high designability by expressing various colors, so the development of eyewear with excellent designability using light-emitting polarizing elements is desired.
- An object of the present invention is to provide an optical laminate with excellent design, and a polarizing lens and eyewear using the same.
- the present inventors have found that by combining a light-emitting polarizing element that emits light by itself and a light-reflecting layer that has a mirror function that reflects a specific wavelength, new design properties can be obtained.
- the present invention has been completed by finding that an optical layered product having the above properties and a polarizing lens and eyewear using the same can be created.
- An optical laminate includes a light reflecting layer, a light-emitting polarizing element, and a non-light-emitting polarizing element,
- the light reflective layer has a reflective property in the visible light range
- the light emission polarizing element emits light when irradiated with ultraviolet light, and the light emission has at least one maximum emission wavelength in the visible light range
- the non-light-emitting polarizing element is an absorbing polarizing element and/or a reflective polarizing element, the alignment axis of the luminescence polarizing element and the alignment axis of the non-luminescence polarizing element are arranged parallel or substantially parallel to each other; From the outside light incident side, the light reflecting layer, the light emitting polarizing element, and the non-light emitting polarizing element are arranged in this order, or the light emitting polarizing element, the light reflecting layer, and the non-light emitting polarizing element are arranged in this order.
- the present invention can provide an optical laminate with excellent design, and a polarizing lens and eyewear using the same.
- FIG. 1 is a schematic diagram showing an embodiment of an optical layered body of the present invention
- FIG. FIG. 4 is a schematic diagram showing another embodiment of the optical layered body of the present invention
- 1 is a schematic diagram showing an optical layered body of Example 1.
- FIG. FIG. 11 is a schematic diagram showing an optical layered body of Example 7;
- FIG. 11 is a schematic diagram showing an optical layered body of Example 5;
- FIG. 11 is a schematic diagram showing an optical layered body of Example 11;
- 3 is a schematic diagram showing an optical layered body of Comparative Example 1.
- FIG. FIG. 11 is a schematic diagram showing an optical layered body of Comparative Example 4;
- FIG. 11 is a schematic diagram showing an optical layered body of Comparative Example 6;
- An optical laminate 100 includes a light reflecting layer 10, a light emitting polarizing element 30, and a non-light emitting polarizing element 40, as shown in FIG.
- the reflective layer 10, the light-emitting polarizing element 30, and the non-light-emitting polarizing element 40 are arranged in this order.
- an optical layered body 110 according to another embodiment of the present invention includes a light reflecting layer 10, a light emitting polarizing element 30, and a non-light emitting polarizing element 40. , the light-emitting polarizing element 30, the light reflecting layer 10, and the non-light-emitting polarizing element 32 are arranged in this order.
- the optical stacks 100, 200 may optionally further comprise supports.
- the support is a laminate in which the light reflecting layer 10, the light emitting polarizing element 30, and the non-light emitting polarizing element 40 are laminated in this order, or the light emitting polarizing element 30, the light reflecting layer 10, and the non-light emitting polarizing element 40. is preferably provided on one or both surfaces of the laminate laminated in this order.
- the optical laminate has a structure in which each member is laminated in the order of first support/light reflecting layer/emission polarizing element/non-emission polarizing element/second support, or the first support/ It is preferable to have a configuration in which the light emitting polarizing element/light reflecting layer/non-light emitting polarizing element/second support are laminated in this order.
- the first support is arranged on the outside light incident side when the eyewear is worn.
- the second support is disposed on the side integrally molded with the resin during processing of the polarizing lens, which will be described later.
- the alignment axis of the light emitting polarizing element and the alignment axis of the non-light emitting polarizing element are arranged parallel or substantially parallel to each other.
- the orientation axis corresponds to the stretching direction of these uniaxially stretched elements.
- Parallel means that each orientation axis is arranged in a 0 degree relationship with respect to one of the orientation axes, and “substantially parallel” means that either orientation axis This means that each orientation axis is arranged within a range of -5 degrees to +5 degrees (excluding 0 degrees) based on .
- a light reflecting layer is a layer having a reflective characteristic in the visible light range.
- the visible light range refers to a wavelength range of 380 nm or more and 780 nm or less.
- the light reflecting layer may be a single layer, or may be a laminate of multiple layers.
- a thin film obtained by laminating an inorganic material such as a metal on a base material by a vapor deposition method can be used.
- a multi-layered film obtained by alternately laminating dielectric materials having different refractive indices can be used. All of them can be used as the light reflecting layer as long as they have reflection properties (specularity) in the visible light region.
- a cholesteric liquid crystal layer is suitable as another example of the light reflecting layer.
- Cholesteric liquid crystal is an organic material that can provide reflection properties in the visible light range. has the function of selectively reflecting the circularly polarized component in the same direction as
- An optical laminate that uses a cholesteric liquid crystal layer with a fixed helical orientation so that light is reflected in a desired wavelength range as a light reflection layer exhibits a vivid color tone and metallic reflected light equivalent to metallic luster. can be given decorativeness.
- the light reflecting layer preferably comprises at least one cholesteric liquid crystal layer in order to impart high polarizing properties when laminated with a polarizing member.
- a light reflection layer is a cholesteric liquid crystal layer R body (hereinafter also referred to as “R body” or “light reflection layer R”) that has a state in which liquid crystal molecules are helically aligned in a right-handed manner and reflects a right-handed circularly polarized light component.
- R body cholesteric liquid crystal layer R body
- L-body cholesteric liquid crystal layer L-body
- Three or more layers may be provided using a plurality of one or both of the R-body and the L-body.
- the polarizing property is not important, only the light reflecting layer of either the R-type or the L-type may be provided.
- both the R-body and the L-body are provided, either one may be arranged on the external light incident side, and they may be arranged in any order.
- these layer structures are not particularly limited as long as the effects of the present invention are exhibited, and can be arbitrarily selected according to the embodiment.
- the reflectance of the light-reflecting layer depends on the design of the eyewear described later, but the maximum reflectance in the visible light range (380 nm or more and 780 nm or less) is preferably at least 10% or more, and is preferably 20% or more. more preferred.
- the color of the reflected light is determined by the wavelength range in which the light reflecting layer exhibits maximum reflectance. For example, when the light reflecting layer exhibits a maximum reflectance in the range of 400 nm or more and 500 nm or less, it exhibits a blue to green reflection color, and when it exhibits a maximum reflectance in a range of 500 nm or more and 600 nm or less, it exhibits a green to orange color.
- the reflection color is orange to red.
- the light reflecting layer has a reflection band in substantially the entire visible light range of 400 nm or more and 700 nm or less, it exhibits a silver reflection color.
- the reflectance in each wavelength region is approximately the same.
- the average reflectance in the visible light region is preferably at least 10% or more, more preferably 20% or more. This makes it possible to impart a bright, mirror-like metallic surface to the lens of the eyewear.
- the reflectance of the light-reflecting layer can be measured, for example, using a spectrophotometer in accordance with JIS R 3106:2019. done.
- natural light is used as the light source, and the reflectance can be obtained by setting the measurement samples in the directions of 0 degree and 90 degrees, respectively, and measuring, and calculating the average value of the reflectances.
- the cholesteric liquid crystal layer is formed from a nematic liquid crystal having chirality or a composition obtained by adding a chiral agent to the nematic liquid crystal (hereinafter also referred to as "cholesteric liquid crystal layer-forming composition").
- a method of adding a chiral agent to a nematic liquid crystal to obtain a cholesteric liquid crystal layer is preferable because the helix direction of the liquid crystal molecules or the reflection wavelength of the cholesteric liquid crystal layer can be arbitrarily designed depending on the type or amount of the chiral agent.
- a nematic liquid crystal is preferably a nematic liquid crystal monomer having a polymerizable group because the nematic liquid crystal is used in a fixed helical orientation state, unlike a so-called liquid crystal operated by an electric field.
- a nematic liquid crystal monomer having a polymerizable group is a compound that has a polymerizable group in its molecule and exhibits liquid crystallinity within a specific temperature range or concentration range.
- polymerizable groups include (meth)acryloyl groups, vinyl groups, chalconyl groups, cinnamoyl groups, and epoxy groups.
- Liquid crystal compounds with rod-shaped or platelet-shaped substituents are known in the art as calamitic liquid crystals.
- Nematic liquid crystal monomers having such a polymerizable group are specifically polymerizable liquid crystals described in JP-A-2003-315556 and JP-A-2004-29824, PALIOCOLOR series (manufactured by BASF), Examples include the RMM series (manufactured by Merck). These nematic liquid crystal monomers having a polymerizable group can be used alone or in combination.
- a compound having a polymerizable group is preferable, as is the case with the nematic liquid crystal monomer having a polymerizable group, because it can helically align a nematic liquid crystal monomer having a polymerizable group in a right-handed or left-handed manner.
- Examples of such a chiral agent include Paliocolor LC756 (manufactured by BASF) and compounds described in JP-A-2002-179668.
- the direction of reflected circularly polarized light is determined by the type of chiral agent, and the reflection wavelength of the cholesteric liquid crystal layer can be changed according to the amount of the chiral agent added to the nematic liquid crystal.
- the amount of the chiral agent to be added varies depending on the type of chiral agent and the wavelength to be reflected. It is preferably from 0.5 parts by mass to 30 parts by mass, more preferably from 1 part by mass to 20 parts by mass, and even more preferably from 3 parts by mass to 10 parts by mass.
- a polymerizable compound having no liquid crystallinity and capable of reacting with a nematic liquid crystal monomer having a polymerizable group can be further added to the composition for forming a cholesteric liquid crystal layer.
- examples of such compounds include UV-curable resins.
- UV-curable resins include dipentaerythritol hexa(meth)acrylate, a reaction product of dipentaerythritol penta(meth)acrylate and 1,6-hexamethylene diisocyanate, triisocyanate having an isocyanuric ring and pentaerythritol tri( Reaction products with meth)acrylates, reaction products of pentaerythritol tri(meth)acrylate and isophorone diisocyanate, dipentaerythritol penta(meth)acrylate, dipentaerythritol tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate , pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, tris(acryloxyethyl)iso
- These ultraviolet curable resins having no liquid crystallinity must be added to such an extent that the nematic liquid crystal monomer having a polymerizable group does not lose liquid crystallinity. It is preferably from 1 part by mass to 20 parts by mass, and more preferably from 1.0 part by mass to 10 parts by mass.
- nematic liquid crystal monomer having a polymerizable group and other polymerizable compounds are UV-curable
- a photopolymerization initiator is added to cure the composition for forming a cholesteric liquid crystal layer containing these with UV rays.
- photopolymerization initiators include 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropane-1,1-hydroxycyclohexylphenyl ketone, 4-(2-hydroxyethoxy)-phenyl(2- Hydroxy-2-propyl)ketone, 1-(4-dodecylphenyl)-2-hydroxy-2-methylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane-1- acetophenone-based compounds such as one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, diethoxyacetophenone; benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2- Benzoin compounds such as dimethoxy-2-phenylacetophenone; benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophen
- auxiliaries are triethanolamine, methyldiethanolamine, triisopropanolamine, n-butylamine, N-methyldiethanolamine, diethylaminoethyl methacrylate, Michler's ketone, 4,4'-diethylaminophenone, 4-dimethylaminobenzoic acid.
- auxiliaries include amine compounds such as ethyl, (n-butoxy)ethyl 4-dimethylaminobenzoate, and isoamyl 4-dimethylaminobenzoate.
- the amount of the photopolymerization initiator and auxiliary agent to be added is preferably within a range that does not affect the liquid crystallinity of the composition for forming a cholesteric liquid crystal layer containing a nematic liquid crystal monomer. It is preferably 0.5 parts by mass or more and 10 parts by mass or less, more preferably 2 parts by mass or more and 8 parts by mass or less with respect to 100 parts by mass of the ultraviolet curable compound. Moreover, it is preferable that the auxiliary agent is 0.5 times or more and 2 times or less the content of the photopolymerization initiator.
- the composition for forming a cholesteric liquid crystal layer further contains a solvent.
- a solvent is not particularly limited as long as it can dissolve the liquid crystal compound, chiral agent, and the like to be used. , is cyclopentanone with good solubility.
- these solvents can be added in an arbitrary ratio, and only one type may be added, or a plurality of solvents may be used in combination. These solvents are removed by drying in a drying oven or drying equipment of a film coating apparatus.
- the composition for forming a cholesteric liquid crystal layer is coated on a substrate such as a polyethylene terephthalate (PET) film or the like so that the thickness is as uniform as possible.
- the coating film is allowed to stand for a certain period of time under temperature conditions such that it is oriented with a helical pitch of .
- alignment treatment such as rubbing or photo-alignment or stretching before coating, the alignment of the cholesteric liquid crystal can be made more uniform, and the haze value of each cholesteric liquid crystal layer can be reduced. becomes possible.
- ultraviolet rays are irradiated with a high-pressure mercury lamp or the like to fix the orientation, thereby obtaining a silver-colored cholesteric liquid crystal layer.
- a method of continuously changing the helical pitch there is a method of setting the atmosphere in which ultraviolet rays are irradiated for curing and the surface irradiated with ultraviolet rays in a specific direction, as described in Japanese Patent Laid-Open No. 2003-139953, for example.
- the desired reflection band can be obtained by adjusting the oxygen concentration in the atmosphere in which the ultraviolet rays are irradiated, the irradiation amount of the ultraviolet rays, the irradiation time, the irradiation temperature, and the like.
- the film thickness of each layer after forming the light reflecting layer is preferably 1 ⁇ m or more and 15 ⁇ m or less, more preferably 2 ⁇ m or more and 10 ⁇ m or less.
- the emitted light polarizing element emits light when irradiated with ultraviolet rays, and the emitted light has at least one maximum emission wavelength in the visible light range.
- the light emission polarizing element is an emission polarizing element in which at least one type of light emission polarizing dye capable of polarizing light emission using absorption of light including ultraviolet light is oriented.
- the higher the degree of polarization of the emitted light the higher the absorption efficiency by the light emission polarizer.
- the degree of polarization of the emitted light is indicated by the order parameter value (OPD) calculated by the following formula (I) at the wavelength where the polarizing action exhibited by the luminescent polarizing dye is the highest in the wavelength range of the absorbed light.
- OPD order parameter value
- Ky in the above formula (I) represents the light transmittance when light polarized orthogonally to the axis showing the highest light absorption in the light emission polarizing element is incident.
- Kz represents the light transmittance when light polarized parallel to the axis showing the highest light absorption in the light emission polarizing element is incident.
- Emission polarizing dyes that can polarize light emission using light absorption generally belong to fluorescent dyes or phosphorescent dyes. It is a dye that can be converted into As such a dye, either a fluorescent dye or a phosphorescent dye may be used, but it is preferable to use a fluorescent dye.
- the wavelength of the light absorbed by the dye is often different from the wavelength of the light emitted by the dye, and is sometimes called a wavelength conversion dye.
- at least one kind of luminescence polarizing dye contained in the luminescence polarizing element preferably has fluorescence emission properties, and in particular, emits light in the visible region by absorbing light in the ultraviolet region to the near-ultraviolet visible region. It is more preferred to have polarizable fluorescence emission properties.
- the light-emitting polarizing dye by orienting the light-emitting polarizing dye on the substrate, it has light absorption anisotropy between the axis oriented on the substrate and the orthogonal axis like a dichroic dye, and the light absorption anisotropy , that is, it exhibits a polarizing function.
- Kz be the light transmittance of (i.e., the transmittance along the axis in which the amount of light transmitted is small), while the light-emitting polarizing element in which the light-emitting polarizing dye is oriented has the highest absorption, and is polarized orthogonally to the axis showing the highest absorption.
- Ky be the light transmittance when light is incident (that is, the transmittance at the axis through which a large amount of light is transmitted). Then, by substituting these Ky and Kz into the above formula (I), the order parameter (OPD), that is, the degree of orientational order can be calculated.
- a light emission polarizing element exhibiting light emission polarization can be obtained by incorporating and orienting one or more light emission polarizing dyes in a substrate.
- Such a light emission polarizing element exhibits various emission colors by adjusting the mixing ratio of the light emission polarizing dye. For example, when the absolute value of the hue a * according to the CIE1976 standard is 5 or less and the absolute value of the hue b * is 5 or less, the emission color from the light emission polarizing element exhibits white.
- the hue a * value and the hue b * value according to the CIE 1976 standard are values generally used as indicators of the hue of light.
- the luminescent polarizing dye is preferably a compound having a stilbene skeleton, a biphenyl skeleton, or a coumarin skeleton as a basic skeleton, or a salt thereof.
- the stilbene skeleton and the biphenyl skeleton as the basic skeleton of the light-emitting polarizing dye have the effect of exhibiting fluorescence emission characteristics by themselves and exhibiting high dichroism by orienting the light-emitting polarizing dye on the substrate. Since this action is due to the structure of each basic skeleton of the stilbene skeleton and the biphenyl skeleton, the basic skeleton structure may further have an optional substituent bonded thereto. However, when the basic skeleton structure is substituted with an azo group, the substitution position is important for obtaining a desired amount of emitted light.
- the luminescence polarizing dye has a coumarin skeleton as a basic skeleton
- the coumarin skeleton has an electron-donating group.
- an electron-donating group and an electron-withdrawing group coexist within the coumarin molecule, and charge transfer occurs within the molecule, resulting in fluorescence emission.
- the emission polarizing dyes may be used alone or in combination of two or more.
- the luminescence polarizing dye preferably has fluorescence emission properties capable of emitting and polarizing light in the visible region by absorbing light in the ultraviolet to near-ultraviolet visible region.
- the visible range (generally 380 nm or more and 780 nm or less), for example, 400 nm or more and 700 nm or less In the wavelength range of 0.04 ⁇ W/cm 2 or more, preferably 0.04 ⁇ W/cm 2 or more, more preferably 0.05 ⁇ W/cm 2 or more, and 0.1 ⁇ W/cm 2 or more.
- ultraviolet light generally means light in a wavelength range of 400 nm or less
- light in a wavelength range of 430 nm or less is also extremely low for human visibility. Therefore, the light in the ultraviolet region to the near-ultraviolet-visible region can be defined as light invisible to the human eye. preferable.
- a luminescence polarizing dye it is possible to obtain a luminescence polarizing element capable of absorbing invisible light and polarizing the emitted light.
- the light-emitting polarizing dye having a stilbene skeleton is preferably a compound represented by the following formula (1) or a salt thereof.
- L and M are, for example, each independently a nitro group, an optionally substituted amino group, an optionally substituted carbonylamide group, a substituted optionally substituted naphthotriazole group, optionally substituted C 1 -C 20 (1 to 20 carbon atoms) alkyl group, optionally substituted vinyl group, optionally substituted selected from the group consisting of an amide group, an optionally substituted ureido group, an optionally substituted aryl group, and an optionally substituted carbonyl group, but is limited to these is not.
- a compound having a stilbene skeleton represented by formula (1) exhibits fluorescence emission, and dichroism can be obtained by orientation. Since the luminescent property is due to the stilbene skeleton, the substituents to which each group of L and M can be bonded are not particularly limited, and may be any substituents. It is preferred that the substituents do not have an azo group.
- each of the above “substituents” is not particularly limited, but includes, for example, the following substituents: amino group; nitro group; cyano group; hydroxyl group; sulfonic acid group; phosphate group; Carboxyl group; Carboxyalkyl groups such as a methylcarboxyl group and an ethylcarboxyl group; halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; Alkoxy groups such as a methoxy group, an ethoxy group, and a propoxy group; Aryloxy groups such as phenoxy group and naphthoxy group; C 1 -C such as methyl group, ethyl group, n-butyl group, n-hexyl group, n-octyl group, n-dodecyl group, isopropyl group, sec-butyl group, tert-buty
- alkyl groups A phenyl group, a naphthyl group, an anthracenyl group, a biphenyl group, a 5- or 6-membered heterocyclic group containing 1 to 3 heteroatoms selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom as ring-constituting atoms aryl groups such as C 1 -C 20 alkylcarbonyl groups such as methylcarbonyl group, ethylcarbonyl group, n-butyl-carbonyl group; Arylcarbonyl groups such as a phenylcarbonyl group, a biphenylcarbonyl group, and a naphthylcarbonyl group; C 1 -C 20 alkylsulfonyl groups such as methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group and n-butyl-sulfonyl group; and
- substituents may have additional substituents, and the additional substituents include those described above.
- the number of chains of such substitutions is not limited.
- compound example 1-5 exemplified later has an amino group as a substituent, the amino group has a triazine group as a substituent, the triazine group has two amino groups as a substituent, and the amino group one of has a phenyl group as a substituent, the phenyl group has a sulfonic acid group as a substituent, and the other of the amino groups has an amino group as a substituent, and the amino group has 2 as a substituent. It has two ethyl groups and both ethyl groups have hydroxy groups as substituents.
- amino groups optionally having substituents include the following: an unsubstituted amino group; methylamino group, ethylamino group, n-butylamino group, tert-butylamino group, n-hexylamino group, dodecylamino group, dimethylamino group, diethylamino group, di-n-butylamino group, ethylmethylamino group, a C 1 -C 20 alkylamino group optionally having a substituent such as an ethylhexylamino group; an arylamino group optionally having a substituent such as a phenylamino group, a diphenylamino group, a naphthylamino group, an N-phenyl-N-naphthylamino group; a C 1 -C 20 alkylcarbonylamino group optionally having a substituent such as a methylcarbonyla
- optionally substituted carbonylamido groups include N-methyl-carbonylamido group (--CONHCH 3 ), N-ethyl-carbonylamido group (--CONHC 2 H 5 ), N-phenyl-carbonylamido group. group (--CONHC 6 H 5 ) and the like.
- the C 1 -C 20 alkyl group of the C 1 -C 20 alkyl group which may have a substituent, for example, methyl group, ethyl group, n-butyl group, n-hexyl group, n-octyl group, n- linear C 1 -C 12 alkyl groups such as dodecyl group; branched C 3 -C 10 alkyl groups such as isopropyl group, sec-butyl group and tert-butyl group; cyclic groups such as cyclohexyl group and cyclopentyl group and C 3 -C 7 alkyl groups of.
- linear or branched alkyl groups are preferable, and linear alkyl groups are more preferable.
- Examples of the vinyl group which may have a substituent include an ethenyl group, a styryl group, a vinyl group having an alkyl group, a vinyl group having an alkoxy group, a divinyl group, and a pentadienyl group.
- Amido groups which may have a substituent include, for example, an acetamide group (--NHCOCH 3 ) and a benzamide group (--NHCOC 6 H 5 ).
- the ureido group which may have a substituent includes, for example, a monoalkylureido group, a dialkylureido group, a monoarylureido group, and a diarylureido group.
- the aryl group of the optionally substituted aryl group includes, for example, a phenyl group, a naphthyl group, an anthracenyl group, a biphenyl group and the like, preferably a C 6 -C 12 aryl group.
- the aryl group may be a 5- or 6-membered heterocyclic group containing 1 to 3 heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur atoms as ring-constituting atoms.
- a heterocyclic group containing an atom selected from a nitrogen atom and a sulfur atom as a ring-constituting atom is preferable.
- Examples of the carbonyl group which may have a substituent include methylcarbonyl group, ethylcarbonyl group, n-butyl-carbonyl group, phenylcarbonyl group and the like.
- Examples of the compound represented by formula (1) include the Kayaphor series (manufactured by Nippon Kayaku Co., Ltd.), the Whitex series such as Whitex RP (manufactured by Sumitomo Chemical Co., Ltd.), and the like. are exemplified, but not limited to.
- the other compound having a stilbene skeleton is preferably a compound represented by the following formula (2) or formula (3) or a salt thereof.
- a compound represented by the following formula (2) or formula (3) or a salt thereof By using these compounds, it is possible to obtain an emission polarizing element that emits brighter light.
- the compounds represented by the following formulas (2) and (3) also exhibit fluorescence due to the stilbene skeleton, and dichroism can be obtained by orienting them.
- X represents a nitro group or an optionally substituted amino group.
- the amino group optionally having substituents is defined in the same manner as the amino group optionally having substituents in formula (1) above.
- X is a nitro group, a C 1 -C 20 alkylcarbonylamino group optionally having a substituent, an arylcarbonylamino group optionally having a substituent, a C 1 -C 20 alkylsulfonylamino group , or an optionally substituted arylsulfonylamino group, more preferably an optionally substituted arylcarbonylamino group.
- R is a hydrogen atom, a chlorine atom, a halogen atom such as a bromine atom or a fluorine atom, a hydroxyl group, a carboxyl group, a nitro group, an optionally substituted alkyl group, a substituent It represents an alkoxy group which may have, or an amino group which may have a substituent.
- the alkyl group optionally having substituent(s) is defined in the same manner as the C 1 -C 20 alkyl group optionally having substituent(s) in formula (1) above.
- the alkoxy group which may or may not have a substituent is preferably a methoxy group, an ethoxy group, or the like.
- the amino group optionally having substituents is defined in the same manner as the amino group optionally having substituents in the above formula (1), preferably methylamino group, dimethylamino group, ethylamino group, diethylamino group , or a phenylamino group.
- R is preferably a hydrogen atom or a C 1 -C 20 alkyl group, and when R is a C 1 -C 20 alkyl group, it is preferably a methyl group.
- R may be bonded to any carbon of the naphthalene ring in the naphthotriazole ring, but when the carbon atoms condensed with the triazole ring are the 1st and 2nd positions, the 3rd, 5th, or Bonding to the 8-position is preferred.
- n is an integer of 0 to 3, preferably 1.
- —(SO 3 H) may be bonded to any carbon atom of the naphthalene ring in the naphthotriazole ring.
- R is a hydrogen atom and n is 1 or 2.
- Y represents an optionally substituted C 1 -C 20 alkyl group, an optionally substituted vinyl group, or an optionally substituted aryl group.
- the optionally substituted C 1 -C 20 alkyl group, vinyl group and aryl group are the optionally substituted C 1 -C 20 alkyl group, vinyl group and aryl group in the above formula (1) are defined in the same way as Among these, Y is preferably an aryl group which may have a substituent, more preferably a naphthyl group which may have a substituent, and an amino group and a sulfo group substituted as substituents. A naphthyl group is particularly preferred.
- Z is defined in the same manner as X in formula (2) above and represents a nitro group or an amino group which may have a substituent, and an amino group which may have a substituent is preferably
- the compound having a biphenyl skeleton is preferably a compound represented by the following formula (4) or a salt thereof.
- P and Q are, for example, each independently a nitro group, an optionally substituted amino group, an optionally substituted carbonylamide group, a substituted optionally substituted naphthotriazole group, optionally substituted C 1 -C 20 alkyl group, optionally substituted vinyl group, optionally substituted amide group, optionally substituted ureido group which may be substituted, an aryl group which may have a substituent, or a carbonyl group which may have a substituent, but is not limited thereto.
- the optionally substituted amino group, carbonylamide group, naphthotriazole group, C 1 -C 20 alkyl group, vinyl group, amide group, ureido group, aryl group and carbonyl group are substituted in the above formula (1). are defined similarly to amino groups, carbonylamido groups, naphthotriazole groups, C 1 -C 20 alkyl groups, vinyl groups, amido groups, ureido groups, aryl groups and carbonyl groups, which may have groups, respectively.
- a compound having an azo group as P and/or Q in the biphenyl skeleton is not suitable because it significantly reduces fluorescence emission.
- the compound represented by the above formula (4) is preferably a compound represented by the following formula (5).
- j independently represents an integer of 0-2.
- R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom, a C 1 -C 4 alkyl group, a C 1 -C 4 alkoxy group, an aralkyloxy group, an alkenyloxy group, a C 1 —C 4 alkylsulfonyl group, C 6 -C 20 arylsulfonyl group, carbonamido group, sulfonamido group, carboxyalkyl group.
- the position where R 1 to R 4 are bonded is not particularly limited, but when the carbon atom bonded to the vinyl group is the 1st position, the 2nd, 4th and 6th positions are preferred, and the 4th position is preferred. is particularly preferred.
- the C 1 -C 4 alkyl group includes, for example, methyl group, ethyl group, propyl group, n-butyl group, sec-butyl group, tert-butyl group, cyclobutyl group and the like.
- C 1 -C 4 alkoxy groups include methoxy, ethoxy, propoxy, n-butoxy, sec-butoxy, tert-butoxy, cyclobutoxy and the like.
- Aralkyloxy groups include, for example, C 7 -C 18 aralkyloxy groups.
- Alkenyloxy groups include, for example, C 1 -C 18 alkenyloxy groups and the like.
- the C 1 -C 4 alkylsulfonyl group includes, for example, methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, n-butylsulfonyl group, sec-butylsulfonyl group, tert-butylsulfonyl group, cyclobutylsulfonyl group and the like. be done.
- the C 6 -C 20 arylsulfonyl group includes phenylsulfonyl group, naphthylsulfonyl group, biphenylsulfonyl group and the like.
- the compound represented by formula (5) can be prepared by a known method, for example, by condensing 4-nitrobenzaldehyde-2-sulfonic acid with a phosphonate and then reducing the nitro group.
- Specific examples of the compound represented by formula (5) include the following compounds described in JP-A-4-226162.
- the salts of the compounds represented by formulas (1) to (5) mean that the free acids of the compounds represented by the above formulas form salts with inorganic cations or organic cations.
- inorganic cations include cations of alkali metals (eg, lithium, sodium, potassium, etc.), ammonium (NH 4 + ), and the like.
- organic cations include organic ammonium represented by the following formula (D).
- Z 1 to Z 4 each independently represent a hydrogen atom, an alkyl group, a hydroxyalkyl group or a hydroxyalkoxyalkyl group, and at least one of Z 1 to Z 4 is hydrogen It is a group other than an atom.
- Z 1 to Z 4 include the following: C 1 -C 6 alkyl groups such as methyl group, ethyl group, butyl group, pentyl group, hexyl group, preferably C 1 -C 4 alkyl groups; Hydroxy C 1 -C 6 alkyl groups such as hydroxymethyl group, 2-hydroxyethyl group, 3-hydroxypropyl group, 2-hydroxypropyl group, 4-hydroxybutyl group, 3-hydroxybutyl group and 2-hydroxybutyl, preferably is hydroxy C 1 -C 4 alkyl; 6 alkoxy C 1 -C 6 alkyl groups, preferably hydroxy C 1 -C 4 alkoxy C 1 -C 4 alkyl groups.
- cations such as lithium, sodium, potassium, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, and ammonium are more preferable.
- Inorganic cations of lithium, ammonium or sodium are particularly preferred.
- the luminescence polarizing dye having a coumarin skeleton preferably has an electron-donating group at the 7-position.
- the electron-donating group include a hydroxyl group, an amino group, an alkoxyl group and the like, preferably an amino group, and more preferably a diethylamino group.
- luminescence polarizing dyes having such a coumarin skeleton examples include 3-(2′-benzothiazolyl)-7-diethylaminocoumarin (coumarin 6), 3-(2′-benzimidazolyl)-7-N,N-diethylaminocoumarin ( coumarin 7), 3-(2′-N-methylbenzimidazolyl)-7-N,N-diethylaminocoumarin (coumarin 30) and the like.
- the light-emitting polarizing dye having the above structure does not have an azo group in the molecule, so the absorption of light caused by the azo bond is suppressed.
- a compound having a stilbene skeleton exhibits a luminescence effect when irradiated with ultraviolet light, and the presence of a strong carbon-carbon double bond in the stilbene skeleton stabilizes the molecule. Therefore, a luminescence polarizing element containing a luminescence polarizing dye having such a specific structure can absorb light and use the energy to polarize light in the visible range.
- the emission polarizing element includes at least one fluorescent dye and/or organic dye different from the above-mentioned emission polarizing dyes, as long as the polarization performance of the emission polarizing element is not impaired.
- may further contain a dichroic dye used for Fluorescent dyes used in combination include, for example, C.I. I. Fluorescent Brightener 5, C.I. I. Fluorescent Brightener 8, C.I. I. Fluorescent Brightener 12, C.I. I. Fluorescent Brightener 28, C.I. I. Fluorescent Brightener 30, C.I. I. Fluorescent Brightener 33, C.I. I. Fluorescent Brightener 350, C.I. I. Fluorescent Brightener 360, C.I. I. Fluorescent Brightener 365 and the like.
- the optical layered body can express a hue that cannot be achieved with each light color.
- the emission color of the light emission polarizing element and the reflection color of the light reflection layer are such that the respective hues shown in the CIE 1976 color space (L * , a * , b * ) are separated on the chromaticity coordinates. It is preferable to combine the colors at the same position, and it is more preferable that the respective hues have a complementary color relationship on the chromaticity coordinates.
- the complementary color relationship means colors that have a large hue difference and make each other's tint stand out.
- each light component of the light emission color of the light emission polarization element and the reflection color of the light reflection layer is developed, and furthermore, the light emission of the light emission polarization element A new hue can be imparted by combining the color and the reflected color of the light reflecting layer.
- the optical layered body by controlling the order of laminating each member and the number of light reflecting layers according to the reflected color of the light reflecting layer and the intensity of the emitted light color of the light polarizing element, it is possible to achieve a desired optical hue.
- Laminates can be adjusted.
- a preferred example of adjusting the hue of the optical layered body is the combination of a light reflection layer having a red reflection hue and a light emission polarizing element that emits blue light, which are separated from each other on the chromaticity coordinates.
- the intensity balance of the color development of each member is good, and the emitted colors of the light reflection layer and the light emission polarizing element overlap more optimally, so the optical laminate has excellent design.
- it is preferable to arrange a light-emitting polarizing element and then a light reflecting layer containing either one of the R-configuration and the L-configuration in order from the external light incident side, and a plurality of layers of the R-configuration and the L-configuration It is more preferable to arrange a light reflecting layer containing one layer and then the light emission polarizing element, and it is more preferable to arrange a light reflecting layer containing either one layer of the R-isomer or L-isomer and then the light emitting light polarizing element in this order.
- the optical layered body combines the reflected color of the light reflecting layer and the emitted color of the light emitting polarizing element outdoors, and can express a new hue that cannot be achieved by the light reflecting layer or the light emitting polarizing element alone.
- indoors only the reflected color of the light reflecting layer, or a combination of the reflected color of the light reflecting layer and the color of the light polarizing element itself can be developed.
- the optical layered body of the present invention can change the color tone indoors and outdoors, and can realize a new hue that cannot be achieved with a light emission polarizing element alone. It is possible to expand design variations in eyewear provided with.
- Examples of preferred combinations of the emitted light color of the light polarizing element and the reflected color of the light reflecting layer are as follows. (1) The light reflecting layer has a maximum reflectance in the wavelength range of 400 nm or more and 500 nm or less, and the emission color of the light polarizing element is blue. (2) The light reflecting layer has a maximum reflectance in the wavelength range of 400 nm or more and 500 nm or less, and the emission color of the light polarizing element is yellow. (3) The light reflecting layer has a maximum reflectance in the wavelength range of 400 nm or more and 500 nm or less, and the emission color of the light polarizing element is green.
- the light reflecting layer has a maximum reflectance in the wavelength range of 400 nm or more and 500 nm or less, and the emission color of the light polarizing element is bluish green.
- the light reflecting layer has a maximum reflectance in the wavelength range of 500 nm or more and 600 nm or less, and the emission color of the light polarizing element is blue.
- the light reflecting layer has a maximum reflectance in the wavelength range of 500 nm or more and 600 nm or less, and the emission color of the light polarizing element is yellow.
- the light reflecting layer has a maximum reflectance in the wavelength range of 500 nm or more and 600 nm or less, and the emission color of the light polarizing element is green.
- the light reflecting layer has a maximum reflectance in the wavelength range of 500 nm or more and 600 nm or less, and the emission color of the light polarizing element is bluish green.
- the light reflecting layer has a maximum reflectance in the wavelength range of 600 nm or more and 700 nm or less, and the emission color of the light polarizing element is blue.
- the light reflecting layer has a maximum reflectance in the wavelength range of 600 nm or more and 700 nm or less, and the emission color of the light polarizing element is yellow.
- the light reflecting layer has a maximum reflectance in the wavelength range of 600 nm or more and 700 nm or less, and the emission color of the light polarizing element is green.
- the light reflecting layer has a maximum reflectance in the wavelength range of 600 nm or more and 700 nm or less, and the emitted light color of the light polarizing element is bluish green.
- the light reflecting layer has a reflection band over a wavelength range of 400 nm or more and 700 nm or less, and the emission color of the light polarizing element is blue.
- the light reflecting layer has a reflection band over a wavelength range of 400 nm or more and 700 nm or less, and the emission color of the light polarizing element is yellow.
- the light reflection layer has a reflection band over a wavelength range of 400 nm or more and 700 nm or less, and the emission color of the light polarizing element is green.
- the light reflecting layer has a reflection band over a wavelength range of 400 nm or more and 700 nm or less, and the emitted light color of the light polarizing element is bluish green.
- the light reflection layer has a reflection band over a wavelength range of 400 nm or more and 900 nm or less, and the emission color of the light emission polarization element is blue.
- the light reflecting layer has a reflection band over a wavelength range of 400 nm or more and 900 nm or less, and the emission color of the light polarizing element is yellow.
- the light reflection layer has a reflection band over a wavelength range of 400 nm or more and 900 nm or less, and the emitted light color of the light polarizing element is green.
- the light reflecting layer has a reflection band over a wavelength range of 400 nm or more and 900 nm or less, and the emission color of the light emission polarizing element is bluish green.
- the light reflecting layer having a maximum reflectance in the wavelength range of 400 nm or more and 500 nm or less is visually recognized as blue.
- the light reflecting layer having a maximum reflectance in the wavelength range of 500 nm or more and 600 nm or less is visually recognized as green.
- the light reflecting layer having a maximum reflectance in the wavelength range of 600 nm or more and 700 nm or less is visually recognized as red.
- the light reflecting layer having a reflection band over a wavelength range of 400 nm or more and 700 nm or less is visually recognized as silver.
- the light reflecting layer having a reflection band over a wavelength range of 400 nm or more and 900 nm or less is visually recognized as silver, and is less colored due to angle dependence during observation.
- Non-light-emitting polarizers are absorptive polarizers and/or reflective polarizers.
- Typical examples of absorptive polarizing elements include polyvinyl alcohol (PVA)-based polarizing films and coated polarizing films, with PVA-based polarizing films being particularly preferred.
- PVA-based polarizing film is generally referred to as a polarizing film, and a known stretching method can be applied to its production method. It is produced by adsorbing a pigment such as a dye and stretching the film uniaxially by about 2 to 5 times.
- dichroic dyes are preferable from the viewpoint of hue design and designability, and direct dyes containing an azo dye having a sulfonic acid group are more preferable from the viewpoint of heat resistance.
- dichroic dyes for example, C.I. I. Direct Yellow 12, C.I. I. Direct Yellow 28, C.I. I. Direct Yellow 44, C.I. I. Direct Yellow 142, C.I. I. Direct Orange 26, C.I. I. Direct Orange 39, C.I. I. Direct Orange 71, C.I. I. Direct Orange 107, C.I. I. Direct Red 2, C.I. I. Direct Red 31, C.I. I. Direct Red 79, C.I. I. Direct Red 81, C.I. I. Direct Red 117, C.I. I. Direct Red 247, C.I. I. Direct Green 80, C.I. I. Direct Green 59, C.I. I. Direct Blue 71, C.I. I.
- Direct Blue 78 C.I. I. Direct Blue 168, C.I. I. Direct Blue 202, C.I. I. Direct Violet 9, C.I. I. Direct Violet 51, C.I. I. Direct Brown 106, C.I. I. Direct Brown 223 and the like.
- the dichroic dye may be a dye that can be produced by a known method. Examples include the method described in the publication. Examples of commercially available dyes include Kayafect Violet P Liquid (manufactured by Nippon Kayaku Co., Ltd.), Kayafect Yellow Y and Kayafect Orange G, Kayafect Blue KW and Kayafect Blue Liquid 400.
- optical properties mainly visibility correction transmittance Ys and visibility correction polarization degree Py
- hue are selected according to the application and design of eyewear products such as polarized sunglasses.
- values obtained from the CIE1976 color space L * , a * , b * ) are designed as appropriate.
- non-light-emitting polarizing element As an example of a non-light-emitting polarizing element, it has optical characteristics such as a visibility correction transmittance Ys of 10% or more and 60% or less and a visibility correction polarization degree of 60% or more, which affects the visibility of eyewear wearers. It preferably exhibits a neutral gray hue from the viewpoint of not giving
- examples of commercially available non-light-emitting polarizing elements for polarized sunglasses containing a dichroic dye include PVA-based resin films (e.g., Gray type manufactured by Nippon Kayaku Co., Ltd., NYSH-30 manufactured by Nippon Kayaku Co., Ltd., etc.
- each film thickness is 25 ⁇ m or more and 35 ⁇ m or less), and these can be preferably applied as non-light-emitting polarizing elements. Also, depending on the design of the eyewear and the visibility of the field of vision, a non-light-emitting polarizing element having a hue such as brown may be employed.
- the non-light-emitting polarizing element may be arranged in the optical laminate so as to be placed on the wearer's viewing side (wearer's side), opposite to the external light incident side. preferred.
- a reflective polarizing element may be used depending on the design of the eyewear.
- the reflective polarizing element include a birefringent interference type including multilayer films with different birefringences, a wire grid type, and the like.
- Examples of commercially available products include Reflective Polarizer Film (manufactured by 3M) and reflective polarizing film WGF (manufactured by Asahi Kasei).
- an absorbing polarizing element and a reflective polarizing element may be used in combination according to the design of the eyewear.
- each member included in the optical laminate may be laminated via an adhesive layer.
- the thickness of each support is preferably 10 ⁇ m or more and 200 ⁇ m or less, more preferably 40 ⁇ m or more and 100 ⁇ m or less.
- the cholesteric liquid crystal layer formed on a plastic substrate such as a PET film is used as a light-emitting polarizing element or a non-light-emitting polarizing element.
- the plastic substrate may be removed, and other layers may be successively laminated to form the above embodiment.
- the support is a transparent film or sheet formed using a resin material, preferably a plastic film.
- resin materials include polycarbonate (PC)-based resins, triacetylcellulose (TAC)-based resins, polyamide (PA)-based resins, and the like.
- PC-based resin it is more preferable to use aromatic PC containing bisphenol A.
- the total light transmittance of the support is preferably 70% or more, more preferably 80% or more, and even more preferably 85% or more.
- an aromatic PC composition a wholly alicyclic polyester composition
- a glass transition temperature it is preferable to use a PA-based resin having a temperature of 130° C. or less.
- PA resin Compared to PC resin, PA resin has less optical anisotropy, suppresses birefringence, and has excellent solvent resistance. In addition, since it has a low specific gravity, is lightweight, and has a low heat distortion temperature, it has good workability during molding. Furthermore, when the resin material of the support is used as an injection molding resin, the injection molding resin that forms the base material of the lens is used to prevent deterioration of the appearance due to the difference in refractive index and to ensure adhesion to the eyewear. From the viewpoint that the supports of the optical layered body are preferably made of the same material, it is preferable to use the PA-based resin as the support of the optical layered body.
- the PA-based resin is preferable because it can suppress the whitening phenomenon of the frame due to the influence of outgassing due to heating, and there is no restriction on the material of the frame.
- one support is triacetyl cellulose (TAC) with low birefringence and the other support is PA resin. is preferred.
- PA-based resins include nylon containing an aliphatic skeleton and aramid composed only of an aromatic skeleton.
- Nylon includes nylon 6, nylon 11, nylon 12, and nylon 66.
- Aramid includes para-aramid and meta-aramid.
- the PA-based resin used for the support of the optical laminate is preferably in the form of a transparent film or sheet, and for example, a commercially available nylon film (thickness: 80 ⁇ m) manufactured by EMS can be used.
- each support arranged from the external light incident side to the light emission polarizing element it is preferable to suppress the content of the ultraviolet absorber to an extent that does not interfere with the light emission of the light emission polarizing element. It is more preferable not to contain an ultraviolet absorber.
- the content of the ultraviolet absorber in each support arranged from the external light incident side to the light emission polarizing element is preferably 0% by mass or more and 1% by mass or less, and 0% by mass. It is more preferably 0.5% by mass or less, further preferably 0% by mass or more and 0.1% by mass or less, and particularly preferably 0% by mass.
- the adhesive layer is preferably provided between each member constituting the optical layered body.
- the adhesive layer is preferably optically colorless and transparent.
- UV curable or heat curable adhesives containing monomers or polymers such as vinyl chloride copolymers, modified polyolefins, epoxy-based, fluorine-based, natural rubber-based, and rubber-based synthetic rubbers can be appropriately selected and used. .
- an ultraviolet curing adhesive including a radical polymerization type and / or a cationic polymerization type, especially solvent-free ultraviolet rays
- a curable adhesive can be preferably used.
- the thickness of the adhesive layer can be appropriately determined according to the purpose of use, adhesive strength, etc., and is not particularly limited, but is generally preferably 0.01 ⁇ m or more and 20 ⁇ m or less, and 5 ⁇ m or more and 15 ⁇ m or less. is more preferable.
- the thickness of the adhesive layer is 5 ⁇ m or more, sufficient adhesion to the adherend can be ensured, and when it is 15 ⁇ m or less, the occurrence of optical distortion can be suppressed in the product state. can.
- Each member of the optical laminate is treated with a commercially available treatment apparatus such as corona treatment or plasma treatment during or before the step of bonding each member to improve adhesion. It may be modified.
- a polarizing lens includes the optical layered body of the present invention and is suitably used for eyewear.
- a polarized lens used for eyewear (hereinafter also referred to as a "polarized lens for eyewear") is formed by forming an optical laminate into a desired shape so that the light reflecting layer is on the outside, and integrating it with the lens substrate. can be obtained by Furthermore, eyewear such as sunglasses, goggles, and helmet visors can be obtained by fixing the eyewear polarizing lens to the frame.
- An example of the process of forming a polarizing lens will be described below, but the process is not limited to this.
- the optical laminate is punched into a desired shape and then subjected to bending.
- the method of bending There is no particular limitation on the method of bending, and the bending may be performed through a process that can impart a shape to a spherical or aspherical surface according to the purpose.
- shaping processing is performed in advance using a heat press machine or the like.
- a mold designed to have a predetermined size is used, and is appropriately designed according to the design of the eyewear product.
- the optical laminate is placed in a bending mold (concave mold) and pressed with a hemispherical mold (convex mold or hot iron ball) heated to a predetermined temperature to bend the optical laminate. be able to.
- the processing conditions for the bending are, for example, considering the bendability and heat resistance (such as discoloration of the polarizing element) of the optical layered body, the heating temperature is 70° C. or higher and 120° C. or lower, preferably 80° C. or higher and 100° C. or lower.
- the processing time is in the range of 1 minute or more and 3 minutes or less. At that time, from the film or sheet-like optical layered body, only a part of the optical layered body to be used in the next insert molding step may be trimmed simultaneously or sequentially.
- resin may be injected as a lens base material.
- resin injection is used for products that are particularly excellent in terms of impact resistance, appearance, and eyestrain even for lenses that do not have focal refractive power.
- the resin to be injected is preferably the same material as the member of the optical layered body with which the resin to be injected is in contact, in order to prevent deterioration of the appearance due to the difference in refractive index.
- a resin material is used for the lens base material in order to integrate the optical laminate and the resin into a lens shape (hereinafter also referred to as "integrated processing"). Integral processing can generally use an insert molding method.
- the lens base material is not particularly limited, and for example, thermoplastic resins that can be molded by injection molding, thermosetting resins that are commonly used for eyewear lenses, etc. that can be molded by chu-type polymerization or the like can be used. can be done. Examples of such resins include (meth)acrylic resins such as methyl methacrylate homopolymers, copolymers of methyl methacrylate and one or more other monomers, diethylene glycol bisallyl carbonate homopolymers, and diethylene glycol bisallyl carbonates.
- Diethylene glycol bisallyl carbonate-based resins such as copolymers of and one or more other monomers, acrylonitrile-styrene copolymers, halogen-containing copolymers, homopolymers of monomers having sulfide bonds, monomers having sulfide bonds
- Polysulfide-based resins such as copolymers of and one or more other monomers, polyurea-based resins, PA-based resins, PC-based resins, polystyrene-based resins, polyolefin-based resins, polyvinyl chloride-based resins, polyester-based resins, PET sulfur-containing urethane resins such as urethane-based resins, polyurethane-based resins, polythiourethane-based resins, epoxy-based resins, and the like.
- the lens substrate is made of the same material as the member in contact.
- the support of the optical laminate on the side to be integrally processed is made of a PA-based resin
- the lens substrate is also made of a PA-based resin, so that the support and the lens substrate are fused together. can be done. This makes it possible to obtain a lens in which the optical layered body and the lens substrate are integrated.
- the eyewear includes the polarizing lens described above, and the non-light-emitting polarizing element included in the optical laminate is positioned on the viewing side.
- the polarizing lens may have a hard coat, an antireflection film, or the like formed on its surface as appropriate. Eyewear can be obtained by fixing the polarizing lens to the frame by edging, drilling, screwing, or the like.
- the present invention relates to the following [1] to [7].
- An optical stack comprising at least one light reflective layer, an emitting polarizer, and a non-emitting polarizer,
- the light reflective layer has a reflective property in the visible light range
- the light emission polarizing element emits light when irradiated with ultraviolet light, and the light emission has at least one maximum emission wavelength in the visible light range
- the non-light-emitting polarizing element is an absorbing polarizing element and/or a reflective polarizing element, the alignment axis of the luminescence polarizing element and the alignment axis of the non-luminescence polarizing element are arranged parallel or substantially parallel to each other;
- the light-reflecting layer, the light-emitting polarizing element, and the non-light-emitting polarizing element are arranged in this order, or the light-emitting polarizing element, the light-reflecting layer, and the non-light-emitting polarizing element are
- optical laminate [2] The optical laminate according to the above [1], wherein the light reflecting layer comprises at least one cholesteric liquid crystal layer. [3] The optical laminate according to [1] or [2] above, wherein the reflection characteristics of the light reflecting layer and the emission color of the light emission polarizing element are selected from the following (1) to (20).
- the light reflecting layer has a maximum reflectance at a wavelength of 400 to 500 nm, and the emitted light polarizing element emits blue light.
- the light reflecting layer has a maximum reflectance at a wavelength of 400 to 500 nm, and the emission color of the light polarizing element is yellow.
- the light reflecting layer has a maximum reflectance at a wavelength of 400 to 500 nm, and the emission color of the light polarizing element is green.
- the light reflecting layer has a maximum reflectance at a wavelength of 400 to 500 nm, and the emission color of the light polarizing element is bluish green.
- the light reflecting layer has a maximum reflectance at a wavelength of 500 to 600 nm, and the emitted light polarizing element emits blue light.
- the light reflecting layer has a maximum reflectance at a wavelength of 500 to 600 nm, and the emitted light polarizing element emits yellow light.
- the light reflecting layer has a maximum reflectance at a wavelength of 500 to 600 nm, and the emission color of the light polarizing element is green.
- the light reflecting layer has a maximum reflectance at a wavelength of 500 to 600 nm, and the emission color of the light polarizing element is bluish green.
- the light reflecting layer has a maximum reflectance at a wavelength of 600 to 700 nm, and the emitted light polarizing element emits blue light.
- the light reflecting layer has a maximum reflectance at a wavelength of 600 to 700 nm, and the emitted light polarizing element emits yellow light.
- the light reflecting layer has a maximum reflectance at a wavelength of 600 to 700 nm, and the emission color of the light polarizing element is green.
- the light reflecting layer has a maximum reflectance at a wavelength of 600 to 700 nm, and the emission color of the light polarizing element is bluish green.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 700 nm, and the emission color of the light polarizing element is blue.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 700 nm, and the emission color of the light polarizing element is yellow.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 700 nm, and the emission color of the light polarizing element is green.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 700 nm, and the emission color of the light polarizing element is bluish green.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 900 nm, and the emission color of the light emission polarizing element is blue.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 900 nm, and the emission color of the emitted light polarizing element is yellow.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 900 nm, and the emitted light polarizing element emits green light.
- the light reflecting layer has a reflection band over a wavelength range of 400 to 900 nm, and the emission color of the light polarizing element is bluish green.
- a polarizing lens comprising the optical laminate according to any one of [1] to [5] above.
- Eyewear comprising the polarizing lens according to [6] above, wherein the non-light-emitting polarizing element is arranged on the viewing side.
- Example 1 Preparation of non-light-emitting polarizing element
- a dye-based PVA-based resin film for polarized sunglasses (“NYSH-30” manufactured by Nippon Kayaku Co., Ltd.) was used.
- the non-light-emitting polarizing element exhibits a gray color, and when the polarization characteristics were measured using a spectrophotometer ("U-4100" manufactured by Hitachi High-Tech Science), the visibility-corrected transmittance (Ys) was 38.0. %, and the visibility-corrected polarization degree (Py) was 99.50%.
- emission polarizing element is prepared according to the method described in Example 1 of WO 2019/022212, and the 4,4'-bis-(sulfostyryl described in Compound Example 5-1 above. ) obtained by stretching a PVA-based resin film containing biphenyl (“VF-PS#7500” manufactured by Kuraray Co., Ltd., thickness 75 ⁇ m).
- the resulting luminescence polarizing element (hereinafter also referred to as "luminescence polarizing element A”) was colorless when observed indoors under a fluorescent lamp, and was irradiated with ultraviolet light using a commercially available black light. At that point, it emitted blue light.
- this luminescence polarizing element A had a maximum emission at a wavelength of 380 nm.
- the light reflecting layer R 640 and the light emitting polarizing element are laminated in the same manner using an ultraviolet curable adhesive, and then the non-light emitting polarizing element and the light emitting polarizing element are laminated so that their absorption axes are parallel. Lamination was performed using an ultraviolet curable adhesive in the same manner as above.
- a non-light-emitting polarizing element and a PC-based resin film as another support (“Panlight Film PC-2151” manufactured by Teijin Limited, film thickness 125 ⁇ m: hereinafter also referred to as “PC support”) were similarly exposed to ultraviolet rays.
- PC support PC-based resin film as another support
- an adhesive layer formed by curing an ultraviolet curable adhesive is omitted.
- the ultraviolet curing adhesive is applied so that the film thickness after curing is about 10 ⁇ m, and the ultraviolet light irradiation is performed by a UV conveyor device manufactured by Eye Graphic Co., Ltd. equipped with a high pressure mercury lamp. was used, and carried out from the light reflecting layer R11 side.
- Example 2 (2a) Preparation of non-luminous polarizing element The same as the non-luminous polarizing element described in Example 1.
- the light emission polarizing element is produced according to the method described in Example 1 of WO 2019/022212, using a PVA-based resin film (Kuraray Co., Ltd.) containing a compound represented by the following formula (6). (“VF-PS#7500”)).
- the resulting luminescence polarizing element (hereinafter also referred to as "luminescence polarizing element B”) exhibited a yellow color when observed indoors under a fluorescent lamp, while it was irradiated with ultraviolet light using a commercially available black light. At that point, it emitted yellow light. Further, when the optical properties of this emission polarizing element B were measured using a spectrofluorometer (“F-7100” manufactured by Hitachi High-Tech Science Co., Ltd.), it had a maximum emission at a wavelength of 425 nm.
- the light reflective layer is a PET film ("A4100” manufactured by Toyobo Co., Ltd., film thickness 50 ⁇ m) rubbed as a base material according to the method described in Example 1 of WO 2017/175581. ), a cholesteric liquid crystal layer R (hereinafter also referred to as “light reflecting layer R 460 ”) having a maximum reflectance at a wavelength of 460 nm and a right-handed spiral orientation was produced.
- the film thickness of the resulting light reflecting layer R460 was about 4.5 ⁇ m.
- the reflective surface of the light reflecting layer R460 was laid flat and viewed from directly above (in the front direction), the color was blue.
- Example 3 (3a) Fabrication of non-light-emitting polarizing element It is the same as the non-light-emitting polarizing element described in Example 1.
- the light-reflecting layer is a PET film (manufactured by Toyobo Co., Ltd. "A4100", film thickness 50 ⁇ m) that has been rubbed as a base material according to the method described in Example 1 of JP-A-2003-139953. ), a cholesteric liquid crystal layer R body having a right-handed spiral orientation (hereinafter also referred to as “light reflecting layer R VIS ”) was produced.
- the film thickness of the obtained light reflecting layer RVIS was about 4 ⁇ m.
- the reflective surface of the light reflecting layer RVIS was laid flat and viewed from directly above (in the front direction), the color was silver.
- Example 4 (4a) Fabrication of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 5 (5a) Preparation of non-light-emitting polarizing element Same as the non-light-emitting polarizing element described in Example 1.
- the light reflective layer is a PET film (manufactured by Toyobo Co., Ltd. "A4100", film thickness 50 ⁇ m, rubbed as a base material according to the method described in Example 1 of WO 2017/175581. ) above, a cholesteric liquid crystal layer R (hereinafter also referred to as “light reflecting layer R 640 ”) having a maximum reflectance at a wavelength of 640 nm and a right-handed spiral alignment, and a left-handed spiral having a maximum reflectance at a wavelength of 640 nm
- An oriented cholesteric liquid crystal layer L body (hereinafter also referred to as “light reflecting layer L 640 ”) was prepared.
- each obtained light reflection layer was about 4.5 ⁇ m. Furthermore, by laminating the liquid crystal layer surfaces of the light reflecting layer R 640 and the light reflecting layer L 640 using the ultraviolet curing adhesive described in (1d) of Example 1, a light having two liquid crystal layers A reflective layer (hereinafter also referred to as “light reflective layer R/L 640 )” was prepared. The reflective surface of the light reflective layer R/L 640 was laid flat and viewed from directly above (front direction). At that time, the color was red.
- Example 6 (6a) Preparation of non-light-emitting polarizing element Same as the non-light-emitting polarizing element described in Example 1.
- the light reflective layer is a PET film (manufactured by Toyobo Co., Ltd. "A4100", film thickness 50 ⁇ m, rubbed as a base material according to the method described in Example 1 of WO 2017/175581. ) above, a cholesteric liquid crystal layer R (hereinafter also referred to as “light reflecting layer R 460 ”) having a maximum reflectance at a wavelength of 460 nm and a right-handed spiral orientation, and a left-handed spiral having a maximum reflectance at a wavelength of 460 nm
- An oriented cholesteric liquid crystal layer L body (hereinafter also referred to as “light reflecting layer L 460 ”) was prepared.
- each obtained reflective layer was about 4.5 ⁇ m. Furthermore, by laminating the liquid phase layer surfaces of the light reflecting layer R 460 and the light reflecting layer L 460 using the ultraviolet curing adhesive described in Example 1, a light reflecting layer having two liquid crystal layers ( Hereinafter, a light reflecting layer R/L 460 ) was produced. In addition, when the light reflecting layer R/L 460 was laid flat with the reflecting surface facing upward and viewed from directly above (front direction), the color was blue.
- Example 7 (7a) Preparation of non-luminous polarizing element Same as the non-luminous polarizing element described in Example 1.
- the surface of the light reflecting layer R 640 from which the PET film was removed and the non-light-emitting polarizing element were similarly laminated using an ultraviolet curing adhesive. They were arranged so that the absorption axes were parallel.
- a non-light-emitting polarizing element and a PC-based resin film manufactured by Teijin Ltd. “Panlite Film PC-2151”, film thickness 125 ⁇ m
- 4 TAC support 22/light emitting polarizing element 31/light reflecting layer R11/non-light emitting polarizing element 41/PC support 23
- each condition of the lamination step is the same as the condition described in the first embodiment.
- Example 8 Fabrication of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 9 (9a) Fabrication of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 10 (10a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 11 (11a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- the PET film on the light reflecting layer R 640 side of the light reflecting layer R/L 640 was peeled off.
- the subsequent steps are the same as in Example 5 (5d), and the optical laminate 230 shown in FIG. An element 41/PC support 23) was produced.
- Example 12 (12a) Fabrication of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 13 (13a) Production of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- the light emission polarizing element is produced according to the method described in Example 4 of WO 2019/022212, using a PVA-based resin film (Kuraray Co., Ltd.) containing a compound represented by the following formula (7). (“VF-PS#7500”)).
- the resulting luminescence polarizing element (hereinafter also referred to as "luminescence polarizing element C”) exhibits a pale yellow color when observed indoors under a fluorescent lamp, while it is irradiated with ultraviolet light using a commercially available black light. Then, it emitted blue-green light. Further, when the optical characteristics of this emission polarizing element C were measured using a spectrofluorophotometer ("F-7100" manufactured by Hitachi High-Tech Science), it had a maximum emission at a wavelength of 470 nm.
- F-7100 spectrofluorophotometer
- Example 14 (14a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 15 (15a) Fabrication of non-light-emitting polarizing element This is the same as the non-light-emitting polarizing element described in Example 1.
- Example 16 (16a) Fabrication of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 17 (17a) Production of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 18 (18a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 19 (19a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 20 (20a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 21 (21a) Fabrication of non-light-emitting polarizing element It is the same as the non-light-emitting polarizing element described in Example 1.
- Example 22 Fabrication of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 23 (23a) Preparation of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 24 (24a) Production of non-light-emitting polarizing element The same as the non-light-emitting polarizing element described in Example 1.
- Example 1 Each member was laminated in the same manner as in Example 1 except that the luminescence polarizing element A was not used, and an optical laminate 300 shown in FIG. An optical laminate having the configuration of the PC support 23) was produced.
- Example 2 Each member was laminated in the same manner as in Example 2 except that the luminescence polarizing element B was not used, and an optical laminate 300 shown in FIG. An optical laminate having the configuration of the PC support 23) was produced.
- Example 3 Each member was laminated in the same manner as in Example 3 except that the luminous polarization element A was not used, and an optical laminate 300 (TAC support 22/light reflecting layer R11/non-luminous polarizing element 41/ An optical laminate having the configuration of the PC support 23) was produced.
- Example 4 Each member was laminated in the same manner as in Example 5 except that the emission polarizing element A was not used, and an optical laminated body 310 (TAC support 22/light reflecting layer L12/light reflecting layer R11/non An optical laminate having a configuration of light emission polarizing element 41/PC support 23) was produced.
- Example 5 Each member was laminated in the same manner as in Example 6 except that the emission polarizing element B was not used, and an optical laminated body 310 (TAC support 22/light reflecting layer L12/light reflecting layer R11/non An optical laminate having a configuration of light emission polarizing element 41/PC support 23) was produced.
- Example 6 Each member was laminated in the same manner as in Example 1, except that the light reflecting layer R 640 was not used. An optical laminate having the structure of /PC support 23) was produced.
- Example 7 Each member was laminated in the same manner as in Example 2 except that the light reflecting layer R 460 was not used, and an optical laminate 320 (TAC support 22/light-emitting polarizing element 31/non-light-emitting polarizing element 41) shown in FIG. An optical laminate having the structure of /PC support 23) was produced.
- Example 8 Each member was laminated in the same manner as in Example 13 except that the light reflecting layer R 640 was not used, and an optical laminate 320 (TAC support 22/light-emitting polarizing element 31/non-light-emitting polarizing element 32) shown in FIG. An optical laminate having the structure of /PC support 23) was produced.
- Example 9 Each member was laminated in the same manner as in Example 14 except that the light reflecting layer R 640 was not used, and an optical laminate 320 (TAC support 22/light-emitting polarizing element 31/non-light-emitting polarizing element 32) shown in FIG. An optical laminate having the structure of /PC support 23) was produced.
- each optical layered body was placed with the TAC side facing the light source side, and observed from the front direction and oblique directions (about 35 degrees to 45 degrees) in the vertical and horizontal directions.
- Table 1 shows the evaluation of each optical layered body produced in Examples 1-24
- Table 2 shows the evaluation of each optical layered body produced in Comparative Examples 1-9.
- the optical layered body is configured such that the left side (TAC side) is the outside light incident side.
- gray indicates the hue of the non-light-emitting polarizing element itself.
- A1 Only the reflected color of the light reflecting layer is observed.
- A2 The color of the non-light-emitting polarizing element itself is observed.
- B The color of the light emission polarizing element itself and the reflected color of the light reflecting layer are observed together.
- C Only the color of the emitted light polarizer itself is observed.
- D The color of the light-emitting polarizing element itself and the color of the non-light-emitting polarizing element are observed together.
- the reflected color of the light reflecting layer could be enhanced under outdoor conditions. It was shown that it is possible to adjust the hue of the appearance by changing the configuration of the light reflecting layer.
- Examples 7 to 12 and 19 to 24 having the light emission polarizing element on the external light incident side under indoor conditions, when using the light emitting polarizer with an emission color of yellow, blue-green, or green, the color of the light reflecting layer was strongly observed. In addition, under outdoor conditions, the emission color of the emission polarizing element and the reflection color of the light reflecting layer were combined to obtain a new hue, and the emission color of the emission polarizing element was observed to be strong. As a result, even in an optical layered body having a light emission polarizing element on the external light incident side, by including both the light reflecting layer and the light emitting polarizing element in the optical layered body, the conventional type that can switch the hue by ultraviolet light irradiation.
- Comparative Examples 1 to 5 which are optical laminates having a conventional light reflecting layer, no change in appearance hue was observed under indoor and outdoor conditions.
- Comparative Examples 6 to 9 which are optical laminates composed of a conventional light-emitting polarizing element and a non-light-emitting polarizing element, only the emission color of the light-emitting polarizing element can be switched by ultraviolet light irradiation, and no light is emitted under indoor conditions. The hue of the polarizer was also observed.
- the optical layered body of the present invention combines the reflected color and the emitted color outdoors, and can give a new hue that cannot be achieved with the light reflecting layer or the light emitting polarizing element alone.
- indoors only the reflected color of the light reflecting layer or a combination of the color of the light polarizing element itself and the reflected color of the light reflecting layer can be given.
- the optical layered body of the present invention can change the color tone indoors and outdoors, and can obtain a new hue that cannot be achieved with a light emission polarizing element alone, and exhibits excellent designability. Therefore, by applying such an optical layered body to eyewear, it is possible to widen the variations of eyewear design.
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Abstract
Description
前記光反射層は、可視光域に反射特性を有し、
前記発光偏光素子は、紫外光線の照射により発光し、当該発光は可視光域に少なくとも一つの極大発光波長を有し、
前記非発光偏光素子は、吸収型偏光素子及び/又は反射型偏光素子であり、
前記発光偏光素子の配向軸と前記非発光偏光素子の配向軸は、互いに平行又は略平行に配置され、
外光入射側から、前記光反射層、前記発光偏光素子、前記非発光偏光素子の順、又は前記発光偏光素子、前記光反射層、前記非発光偏光素子の順に配置されている。
本発明の一実施形態に係る光学積層体100は、図1に示されるように、光反射層10と、発光偏光素子30と、非発光偏光素子40とを含み、外光入射側から、光反射層10、発光偏光素子30、非発光偏光素子40の順に配置されている。また、本発明の他の実施形態に係る光学積層体110は、図2に示されるように、光反射層10と、発光偏光素子30と、非発光偏光素子40とを含み、外光入射側から、発光偏光素子30、光反射層10、非発光偏光素子32の順に配置されている。光学積層体100、200は、任意に更に支持体を備えていてもよい。支持体は、光反射層10と、発光偏光素子30と、非発光偏光素子40とがこの順で積層された積層体、或いは発光偏光素子30と、光反射層10と、非発光偏光素子40とがこの順で積層された積層体の一方又は両方の面に設けられていることが好ましい。
光反射層は、可視光域に反射特性を有する層である。ここでは、可視光域とは、380nm以上780nm以下範囲の波長領域をいう。光反射層は単層であってもよく、複数の層が積層されていてもよい。光反射層としては、例えば、基材上に金属等の無機材料を蒸着法により積層して得られる薄膜を用いることができ、具体的には、金属単体を蒸着して得られる単層膜、屈折率の異なる誘電体材料を交互に積層して得られる多層膜が挙げられる。いずれも可視光域に反射特性(鏡面性)を有しているものであれば光反射層として用いることができる。
発光偏光素子は、紫外光線の照射により発光し、当該発光は可視光域に少なくとも一つの極大発光波長を有する。発光偏光素子は、紫外光を含む光の吸収を利用して発光偏光可能な少なくとも1種の発光偏光色素を配向させた発光偏光素子である。発光した光の偏光度合いが高い程、発光偏光素子による吸収効率も向上する。発光した光の偏光度合いの程度は、吸収された光の波長域において発光偏光色素が示す偏光作用が最も高い波長において、下記式(I)で算出されるオーダーパラメーターの値(OPD)によって示すことができ、好ましくは0.50以上1.00以下、より好ましくは0.81以上0.95以下、更に好ましくは、0.85以上0.94以下の範囲に制御する。
スチルベン骨格を有する発光偏光色素は、好ましくは、下記式(1)で表される化合物又はその塩である。
アミノ基;
ニトロ基;
シアノ基;
ヒドロキシル基;
スルホン酸基;
リン酸基;
カルボキシル基;
メチルカルボキシル基、エチルカルボキシル基等カルボキシアルキル基;
フッ素原子、塩素原子、臭素原子、ヨウ素原子等のハロゲン原子;
メトキシ基、エトキシ基、プロポキシ基等のアルコキシ基;
フェノキシ基、ナフトキシ基等アリールオキシ基;
メチル基、エチル基、n-ブチル基、n-ヘキシル基、n-オクチル基、n-ドデシル基、イソプロピル基、sec-ブチル基、tert-ブチル基、シクロヘキシル基、シクロペンチル基等のC1-C20アルキル基;
フェニル基、ナフチル基、アントラセニル基、ビフェニル基、環構成原子として窒素原子、酸素原子及び硫黄原子からなる群から選択される1~3つのヘテロ原子を含む5員環又は6員環の複素環基等のアリール基;
メチルカルボニル基、エチルカルボニル基、n-ブチル-カルボニル基等のC1-C20アルキルカルボニル基;
フェニルカルボニル基、ビフェニルカルボニル基、ナフチルカルボニル基等のアリールカルボニル基;
メチルスルホニル基、エチルスルホニル基、プロピルスルホニル基、n-ブチル-スルホニル基等のC1-C20アルキルスルホニル基;並びに
フェニルスルホニル基、ナフチルスルホニル基等のアリールスルホニル基。
非置換のアミノ基;
メチルアミノ基、エチルアミノ基、n-ブチルアミノ基、tert-ブチルアミノ基、n-ヘキシルアミノ基、ドデシルアミノ基、ジメチルアミノ基、ジエチルアミノ基、ジ-n-ブチルアミノ基、エチルメチルアミノ基、エチルヘキシルアミノ基等の置換基を有してもよいC1-C20アルキルアミノ基;
フェニルアミノ基、ジフェニルアミノ基、ナフチルアミノ基、N-フェニル-N-ナフチルアミノ基等の置換基を有してもよいアリールアミノ基;
メチルカルボニルアミノ基、エチルカルボニルアミノ基、n-ブチル-カルボニルアミノ基等の置換基を有してもよいC1-C20アルキルカルボニルアミノ基;
フェニルカルボニルアミノ基、ビフェニルカルボニルアミノ基、ナフチルカルボニルアミノ基等の置換基を有してもよいアリールカルボニルアミノ基;
メチルスルホニルアミノ基、エチルスルホニルアミノ基、プロピルスルホニルアミノ基、n-ブチル-スルホニルアミノ基等のC1-C20アルキルスルホニルアミノ基;並びに
フェニルスルホニルアミノ基、ナフチルスルホニルアミノ基等の置換基を有してもよいアリールスルホニルアミノ基。
ビフェニル骨格を有する化合物は、好ましくは下記式(4)で示される化合物又はその塩である。
メチル基、エチル基、ブチル基、ペンチル基、ヘキシル基等のC1-C6アルキル基、好ましくはC1-C4アルキル基;
ヒドロキシメチル基、2-ヒドロキシエチル基、3-ヒドロキシプロピル基、2-ヒドロキシプロピル基、4-ヒドロキシブチル基、3-ヒドロキシブチル基、2-ヒドロキシブチル等のヒドロキシC1-C6アルキル基、好ましくはヒドロキシC1-C4アルキル基;並びに
ヒドロキシエトキシメチル基、2-ヒドロキシエトキシエチル基、3-ヒドロキシエトキシプロピル基、3-ヒドロキシエトキシブチル基、2-ヒドロキシエトキシブチル基等のヒドロキシC1-C6アルコキシC1-C6アルキル基、好ましくはヒドロキシC1-C4アルコキシC1-C4アルキル基。
クマリン骨格を有する発光偏光色素は、好ましくは7位に電子供与性基を有している。電子供与性基としては、例えば、水酸基、アミノ基、アルコキシル基等が挙げられ、アミノ基であることが好ましく、ジエチルアミノ基であることがより好ましい。このようなクマリン骨格を有する発光偏光色素として、例えば、3-(2’-ベンゾチアゾリル)-7-ジエチルアミノクマリン(クマリン6)、3-(2’-ベンゾイミダゾリル)-7-N,N-ジエチルアミノクマリン(クマリン7)、3-(2’-N-メチルベンゾイミダゾリル)-7-N,N-ジエチルアミノクマリン(クマリン30)等が挙げられる。
発光偏光素子は、発光偏光素子の偏光性能を阻害しない範囲で、上述した発光偏光色素とは異なる少なくとも1種の蛍光染料及び/又は有機染料として後述の非発光偏光子素子に用いる二色性染料を更に含んでいてもよい。併用される蛍光染料としては、例えば、C.I.Fluorescent Brightener 5、C.I.Fluorescent Brightener 8、C.I.Fluorescent Brightener 12、C.I.Fluorescent Brightener 28、C.I.Fluorescent Brightener 30、C.I.Fluorescent Brightener 33、C.I.Fluorescent Brightener 350、C.I.Fluorescent Brightener 360、C.I.Fluorescent Brightener 365等が挙げられる。
(1)光反射層は、波長400nm以上500nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が青色である。
(2)光反射層は、波長400nm以上500nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が黄色である。
(3)光反射層は、波長400nm以上500nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が緑色である。
(4)光反射層は、波長400nm以上500nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が青緑色である。
(5)光反射層は、波長500nm以上600nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が青色である。
(6)光反射層は、波長500nm以上600nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が黄色である。
(7)光反射層は、波長500nm以上600nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が緑色である。
(8)光反射層は、波長500nm以上600nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が青緑色である。
(9)光反射層は、波長600nm以上700nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が青色である。
(10)光反射層は、波長600nm以上700nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が黄色である。
(11)光反射層は、波長600nm以上700nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が緑色である。
(12)光反射層は、波長600nm以上700nm以下の範囲に極大反射率を有し、発光偏光素子の発光色が青緑色である。
(13)光反射層は、波長400nm以上700nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が青色である。
(14)光反射層は、波長400nm以上700nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が黄色である。
(15)光反射層は、波長400nm以上700nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が緑色である。
(16)光反射層は、波長400nm以上700nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が青緑色である。
(17)光反射層は、波長400nm以上900nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が青色である。
(18)光反射層は、波長400nm以上900nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が黄色である。
(19)光反射層は、波長400nm以上900nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が緑色である。
(20)光反射層は、波長400nm以上900nm以下の範囲に亘って反射帯域を有し、発光偏光素子の発光色が青緑色である。
非発光偏光素子は、吸収型偏光素子及び/又は反射型偏光素子である。吸収型偏光素子としては、代表的には、ポリビニルアルコール(PVA)系偏光フィルム、及び塗工式偏光フィルム等が挙げられ、特に、PVA系偏光フィルムを好適に用いることができる。PVA系偏光フィルムは、一般には偏光素膜ともいい、その作製方法は公知の延伸方法を適用することができ、具体的には、PVA又はその誘導体を含有する高分子フィルムにヨウ素や二色性染料などの色素を吸着させ、該フィルムを一軸に2~5倍程度に延伸配向させて製造される。特に、色相設計及びデザイン性の観点から、二色性染料が好ましく、更に耐熱性の観点ではスルホン酸基をもつアゾ色素を含有する直接染料が好ましい。
光反射層、発光偏光素子及び非発光偏光素子との各層間には、第三、第四・・・となる支持体を設けてもよい。第一の支持体と第二の支持体、及び第三、第四・・・の支持体は、同一材料であってもよく、アイウェアの設計に応じて、それぞれ異なる材料であってもよい。また、光学積層体に含まる各部材は、接着層を介して積層してもよい。支持体の厚さは、それぞれ10μm以上200μm以下であることが好ましく、40μm以上100μm以下であることがより好ましい。
接着層は、光学積層体を構成する各部材の間に設けられることが好ましい。接着層は光学的に無色透明であることが好ましく、例えば、架橋剤とPVA系樹脂とを含む水系接着剤、アクリル系重合体、シリコーン系ポリマー、ポリエステル、ポリウレタン、ポリアミド、ポリビニルエーテル、酢酸ビニル/塩化ビニルコポリマー、変性ポリオレフィン、エポキシ系、フッ素系、天然ゴム系、合成ゴム等のゴム系などのモノマー又はポリマーを含む紫外線硬化系又は熱硬化系の接着剤を適宜に選択して用いることができる。本発明においては、積層工程の効率化と各部材間の密着性を確保しやすい観点から、ラジカル重合型及び/又はカチオン重合型を含む紫外線硬化系の接着剤、その中でも特に、無溶剤の紫外線硬化系の接着剤を好適に採用することができる。
偏光レンズは、本発明の光学積層体を備えており、アイウェアに好適に用いられる。アイウェアに用いられる偏光レンズ(以下、「アイウェア用偏光レンズ」ともいう)は、光反射層が外側になるように光学積層体を所望の形状に成形し、レンズ基材と一体化させることによって得ることができる。更に、アイウェア用偏光レンズをフレームに固定することで、サングラスやゴーグル、ヘルメット用バイザーといったアイウェアを得ることができる。以下、偏光レンズの形成工程の一例について示すが、これに限定されるものではない。
アイウェアは、上述の偏光レンズを備えており、光学積層体に含まれる非発光偏光素子が視認側に配置されている。偏光レンズは、その表面に、適宜、ハードコート、反射防止膜などが形成されていてもよい。偏光レンズを、玉摺り、穴あけ、ネジ締め等によりフレームに固定することで、アイウェアを得ることができる。
[1]
少なくとも1つの光反射層と、発光偏光素子と、非発光偏光素子とを含む光学積層体であって、
前記光反射層は、可視光域に反射特性を有し、
前記発光偏光素子は、紫外光線の照射により発光し、当該発光は可視光域に少なくとも一つの極大発光波長を有し、
前記非発光偏光素子は、吸収型偏光素子及び/又は反射型偏光素子であり、
前記発光偏光素子の配向軸と前記非発光偏光素子の配向軸は、互いに平行又は略平行に配置され、
外光入射側から、前記光反射層、前記発光偏光素子、前記非発光偏光素子の順、又は前記発光偏光素子、前記光反射層、前記非発光偏光素子の順に配置されていることを特徴とする光学積層体。
[2]
前記光反射層は、少なくとも一層のコレステリック液晶層を備える上記[1]に記載の光学積層体。
[3]
前記光反射層の反射特性及び前記発光偏光素子の発光色が以下の(1)~(20)から選択される上記[1]又は[2]に記載の光学積層体。
(1)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が青色である。
(2)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が黄色である。
(3)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が緑色である。
(4)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が青緑色である。
(5)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が青色である。
(6)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が黄色である。
(7)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が緑色である。
(8)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が青緑色である。
(9)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が青色である。
(10)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が黄色である。
(11)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が緑色である。
(12)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が青緑色である。
(13)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青色である。
(14)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が黄色である。
(15)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が緑色である。
(16)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青緑色である。
(17)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青色である。
(18)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が黄色である。
(19)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が緑色である。
(20)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青緑色である。
[4]
外光入射側から前記光反射層、前記発光偏光素子、及び前記非発光偏光素子をこの順に備える、上記[1]~[3]のいずれか1つに記載の光学積層体。
[5]
外光入射側から前記発光偏光素子、前記光反射層、及び前記非発光偏光素子をこの順に備える、上記[1]~[3]のいずれか1つに記載の光学積層体。
[6]
上記[1]~[5]のいずれか1つに記載の光学積層体を備える偏光レンズ。
[7]
上記[6]に記載の偏光レンズを備え、前記非発光偏光素子が視認側に配置されるアイウェア。
(1a)非発光偏光素子の準備
吸収型偏光素子の非発光偏光素子として、偏光サングラス用の染料系PVA系樹脂フィルム(日本化薬社製「NYSH-30」)を使用した。非発光偏光素子は、グレー色を呈しており、分光光度計(日立ハイテクサイエンス社製「U-4100」)を用いて偏光特性を測定したところ、視感度補正透過率(Ys)は38.0%、視感度補正偏光度(Py)は99.50%であった。また、このとき、L*a*b*色空間による色相は、a*=-1.1、b*=5.3であった。
発光偏光素子は、国際公開第2019/022212号の実施例1に記載の方法に従い、上述の化合物例5-1に記載の4,4’-ビス-(スルホスチリル)ビフェニルを含むPVA系樹脂フィルム(クラレ社製「VF-PS#7500」、厚さ75μm)を用いて延伸加工することにより得た。得られた発光偏光素子(以下、「発光偏光素子A」ともいう)は、蛍光灯下の室内で観察したときは、無色を呈しており、一方、市販のブラックライトを用いて紫外光照射したところ、青色に発光した。また、この発光偏光素子Aを分光蛍光光度計(日立ハイテクサイエンス社製「F-7100」)を用いて光学特性を測定したところ、波長380nmに極大発光を有していた。
光反射層としては、国際公開第2017/175581号の実施例1に記載の方法に従い、基材としてラビング処理されたPETフィルム(東洋紡社製「A4100」、膜厚50μm)上に、波長640nmに極大反射率を有し右巻き螺旋配向を有するコレステリック液晶層R体(以下、「光反射層R640」ともいう)を作製した。得られた光反射層R640の膜厚は約4.5μmであった。また、光反射層R640の反射面を上にして平置きし、真上(正面方向)から見たときの色味は、赤色を呈していた。
光反射層R640の液晶層面と支持体として紫外線吸収剤を含まないTAC系樹脂フィルム(IPI社製「13SG80S-LH」、膜厚80μm)とを、国際公開第2019/116760号の実施例1に記載の方法に従って作製した紫外線硬化型接着剤を用いて積層した後、光反射層R640のPETフィルムを剥離することで、片面に支持体としてTAC系樹脂フィルム(以下、「TAC支持体」ともいう)を有する光反射層R640を得た。次に、光反射層R640と発光偏光素子とを、同様に紫外線硬化型接着剤を用いて積層し、続けて、非発光偏光素子と発光偏光素子とを、それぞれの吸収軸が平行となるように同様に紫外線硬化型接着剤を用いて積層した。最後に、非発光偏光素子と他の支持体としてのPC系樹脂フィルム(帝人社製「パンライトフィルムPC-2151」、膜厚125μm:以下、「PC支持体」ともいう)とを同様に紫外線硬化型接着剤を用いて積層することで、TAC支持体22/光反射層R11/発光偏光素子31/非発光偏光素子41/PC支持体23の構成を有する図3に示す光学積層体200を得た。図3において、紫外線硬化型接着剤を硬化してなる接着層は省略されている。なお、各部材の積層工程において、紫外線硬化型接着剤は、いずれも硬化後の膜厚が約10μmとなるように塗布し、紫外光照射は、高圧水銀灯を備えるアイグラフィック社製UVコンベア装置を用い、光反射層R11側から行った。
(2a)非発光偏光素子の準備
実施例1に記載されている非発光偏光素子と同じである。
発光偏光素子は、国際公開第2019/022212号の実施例1に記載の方法に従い、以下の式(6)で表される化合物を含むPVA系樹脂フィルム(クラレ社製「VF-PS#7500」)を用いて延伸加工することにより得た。得られた発光偏光素子(以下、「発光偏光素子B」ともいう)は、蛍光灯下の室内で観察したときは、黄色を呈しており、一方、市販のブラックライトを用いて紫外光照射したところ、黄色に発光した。また、この発光偏光素子Bを分光蛍光光度計(日立ハイテクサイエンス社製「F-7100」)を用いて光学特性を測定したところ、波長425nmに極大発光を有していた。
光反射層は、国際公開第2017/175581号の実施例1に記載の方法に従い、基材としてラビング処理されたPETフィルム(東洋紡社製「A4100」、膜厚50μm)上に、波長460nmに極大反射率を有し右巻き螺旋配向を有するコレステリック液晶層R体(以下、「光反射層R460」ともいう)を作製した。得られた光反射層R460の膜厚は約4.5μmであった。また、光反射層R460の反射面を上にして平置きし、真上(正面方向)から見たときの色味は、青色を呈していた。
(1b)で得た発光偏光素子に代えて(2b)で得た発光偏光素子を用いた点、及び光反射層R640に代えて光反射層R460を用いた点以外は、実施例1と同様にして光学積層体を作製した。
(3a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例1に記載されている発光偏光素子と同じである。
光反射層は、特開2003-139953号公報の実施例1に記載の方法に従い、基材としてラビング処理されたPETフィルム(東洋紡社製「A4100」、膜厚50μm)上に、右巻き螺旋配向を有するコレステリック液晶層R体(以下、「光反射層RVIS」ともいう)を作製した。得られた光反射層RVISの膜厚は約4μmであった。また、光反射層RVISの反射面を上にして平置きし、真上(正面方向)から見たときの色味は、銀色を呈していた。
(1c)で得た光反射層R640に代えて(3c)で得た光反射層RVISを用いた点以外は実施例1と同様にして光学積層体を作製した。
(4a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例2に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
(1b)で得た発光偏光素子Aに代えて(2b)で得た発光偏光素子Bを用いた点、及び(1c)で得た光反射層R640に代えて(3c)で得た光反射層RVISを用いた点以外は、実施例1と同様にして光学積層体を作製した。
(5a)非発光偏光素子の準備
実施例1に記載されている非発光偏光素子と同じである。
実施例1に記載されている発光偏光素子と同じである。
光反射層は、国際公開第2017/175581号の実施例1に記載の方法に従い、基材としてラビング処理されたPETフィルム(東洋紡社製「A4100」、膜厚50μm)上に、波長640nmに最大反射率を有し右巻き螺旋配向を有するコレステリック液晶層R体(以下、「光反射層R640」ともいう)と、波長640nmに極大反射率を有し左巻き螺旋配向を有するコレステリック液晶層L体(以下、「光反射層L640」ともいう)をそれぞれ作製した。得られた各光反射層の膜厚はいずれも約4.5μmであった。更に、光反射層R640及び光反射層L640のそれぞれの液晶層面を実施例1の(1d)に記載の紫外線硬化型接着剤を用いて積層することにより、2層の液晶層を有する光反射層(以下、「光反射層R/L640)ともいう)を作製した。また、光反射層R/L640の反射面を上にして平置きし、真上(正面方向)から見たときの色味は、赤色を呈していた。
光反射層R/L640の光反射層L640面からPETフィルムを除去し、光反射層L640のPETフィルムを除去した面と支持体として紫外線吸収剤を含まないTAC系樹脂フィルム(IPI社製「13SG80S-LH」、膜厚80μm)とを、国際公開第2019/116760号の実施例1に記載の方法で作製した紫外線硬化型接着剤を用いて積層した後、光反射層R/L640の光反射層R640面からPETフィルムを剥離することで、片面にTAC支持体を有する光反射層R/L640を得た。以降の手順は実施例1の(1d)と同じ方法で積層し、図5に示すような光学積層体210(TAC支持体22/光反射層L12/光反射層R11/発光偏光素子31/非発光偏光素子41/PC支持体23)を作製した。
(6a)非発光偏光素子の準備
実施例1に記載されている非発光偏光素子と同じである。
実施例2に記載されている発光偏光素子と同じである。
光反射層は、国際公開第2017/175581号の実施例1に記載の方法に従い、基材としてラビング処理されたPETフィルム(東洋紡社製「A4100」、膜厚50μm)上に、波長460nmに極大反射率を有し右巻き螺旋配向を有するコレステリック液晶層R体(以下、「光反射層R460」ともいう)と、波長460nmに極大反射率を有し左巻き螺旋配向を有するコレステリック液晶層L体(以下、「光反射層L460」ともいう)をそれぞれ作製した。得られた各反射層の膜厚はいずれも約4.5μmであった。更に、光反射層R460及び光反射層L460のそれぞれの液相層面を実施例1に記載の紫外線硬化型接着剤を用いて積層することにより、2層の液晶層を有する光反射層(以下、光反射層R/L460という)を作製した。また、光反射層R/L460の反射面を上にして平置きし、真上(正面方向)から見たときの色味は、青色を呈していた。
(5c)で得た光反射層R/L640に代えて(6c)で得た光反射層R/L460を用いた点と、(5b)の発光偏光素子Aに代えて(2b)で得た発光偏光素子Bを用いた点以外は、実施例5と同様にして光学積層体を作製した。
(7a)非発光偏光素子の準備
実施例1に記載されている非発光偏光素子と同じである。
実施例1に記載されている発光偏光素子と同じである。
実施例1に記載されている光反射層と同じである。
発光偏光素子Aと支持体として紫外線吸収剤を含まないTAC系樹脂フィルム(IPI社製「13SG80S-LH」、膜厚80μm)とを、実施例1に記載の紫外線硬化型接着剤を用いて積層することで、片面にTAC支持体を有する発光偏光素子Aを得た。次に、光反射層R640の液晶層面と発光偏光素子Aとを同様に外線硬化型接着剤を用いて積層し、光反射層R640からPETフィルムを剥離し除去した。続けて、PETフィルムを除去した光反射層R640の面と非発光偏光素子とを同様に紫外線硬化型接着剤を用いて積層し、その際、発光偏光素子Aと非発光偏光素子のそれぞれの吸収軸が平行となるように配置した。最後に、非発光偏光素子と支持体としてPC系樹脂フィルム(帝人社製「パンライトフィルムPC-2151」、膜厚125μm)とを同様に紫外線硬化型接着剤を用いて積層することで、図4に示すような光学積層体220(TAC支持体22/発光偏光素子31/光反射層R11/非発光偏光素子41/PC支持体23)を作製した。なお、積層工程の各条件は、実施例1に記載されている条件と同じである。
(8a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例2に記載されている発光偏光素子と同じである。
実施例2に記載されている光反射層と同じである。
発光偏光素子Aに代えて実施例2の発光偏光素子Bを用いた点と、光反射層R640に代えて実施例2の光反射層R460を用いた点以外は、実施例7と同様にして光学積層体を作製した。
(9a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例1に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
光反射層R640に代えて実施例3の光反射層RVISを用いた点以外は、実施例7と同様にして光学積層体を作製した。
(10a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例2に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
発光偏光素子Aに代えて実施例2の発光偏光素子Bを用いた点と、光反射層R640に代えて実施例3の光反射層RVISを用いた点以外は、実施例7と同様にして光学積層体を作製した。
(11a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例1に記載されている発光偏光素子と同じである。
実施例5に記載されている光反射層と同じである。
発光偏光素子Aと支持体として紫外線吸収剤を含まないTAC系樹脂フィルム(IPI社製「13SG80S-LH」、膜厚80μm)とを、実施例1に記載の紫外線硬化型接着剤を用いて積層することで、片面にTAC支持体を有する発光偏光素子Aを得た。次に、光反射層R/L640の光反射層L640面からPETフィルムを除去し、PETフィルムを除去した光反射層L640面と発光偏光素子Aとを同様に紫外線硬化型接着剤を用いて積層した後、光反射層R/L640の光反射層R640面側のPETフィルムを剥離した。以降の手順は実施例5の(5d)と同じ方法で積層し、図6に示す光学積層体230(TAC支持体22/発光偏光素子31/光反射層L12/光反射層R11/非発光偏光素子41/PC支持体23)を作製した。
(12a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例2に記載されている発光偏光素子と同じである。
実施例6に記載されている光反射層と同じである。
光反射層R/L640に代えて実施例6の光反射層R/L460を用いた点と、発光偏光素子Aに代えて実施例2の発光偏光素子Bを用いた点以外は、実施例11と同様にして光学積層体を作製した。
(13a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
発光偏光素子は、国際公開第2019/022212号の実施例4に記載の方法に従い、以下の式(7)で表される化合物を含むPVA系樹脂フィルム(クラレ社製「VF-PS#7500」)を用いて延伸加工することにより得た。得られた発光偏光素子(以下、「発光偏光素子C」ともいう)は、蛍光灯下の室内で観察したときは、淡黄色を呈しており、一方、市販のブラックライトを用いて紫外光照射したところ、青緑色に発光した。また、この発光偏光素子Cを分光蛍光光度計(日立ハイテクサイエンス社製「F-7100」)を用いて光学特性を測定したところ、波長470nmに極大発光を有していた。
実施例1に記載されている光反射層と同じである。
発光偏光素子Aに代えて(13b)で得た発光偏光素子Cを用いた点以外は、実施例1と同様にして光学積層体を作製した。
(14a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
発光偏光素子は、国際公開第2019/022212号の実施例1に記載の方法に従い、市販品として入手可能なクマリン7を含むPVA系樹脂フィルム(クラレ社製「VF-PS#7500」)を用いて延伸加工することにより得た。得られた発光偏光素子(以下、「発光偏光素子D」ともいう)は、蛍光灯下の室内で観察したときは、緑色を呈しており、一方、市販のブラックライトを用いて紫外光照射したところ、緑色に発光した。また、この発光偏光素子Cを分光蛍光光度計(日立ハイテクサイエンス社製「F-7100」)を用いて光学特性を測定したところ、波長5300nmに極大発光を有していた。
実施例1に記載されている光反射層と同じである。
発光偏光素子Aに代えて(14b)で得た発光偏光素子Dを用いた点以外は、実施例1と同様にして光学積層体を作製した。
(15a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例13に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
発光偏光素子Aに代えて(13b)で得た発光偏光素子Cを用いた点、及び光反射層R640に代えて(3c)で得た光反射層RVISを用いた点以外は、実施例1と同様にして光学積層体を作製した。
(16a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例14に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
発光偏光素子Aに代えて(14b)で得た発光偏光素子Dを用いた点、及び光反射層R640に代えて(3c)で得た光反射層RVISを用いた点以外は、実施例1と同様にして光学積層体を作製した。
(17a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例13に記載されている発光偏光素子と同じである。
実施例5に記載されている光反射層と同じである。
発光偏光素子Aに代えて(13b)で得た発光偏光素子Cを用いた点以外は、実施例5と同様にして光学積層体を作製した。
(18a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例14に記載されている発光偏光素子と同じである。
実施例5に記載されている光反射層と同じである。
発光偏光素子Aに代えて(14b)で得た発光偏光素子Dを用いた点以外は、実施例5と同様にして光学積層体を作製した。
(19a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例13に記載されている発光偏光素子と同じである。
実施例1に記載されている光反射層と同じである。
発光偏光素子Aに代えて(13b)で得た発光偏光素子Cを用いた点以外は、実施例7と同様にして光学積層体を作製した。
(20a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例14に記載されている発光偏光素子と同じである。
実施例1に記載されている光反射層と同じである。
発光偏光素子Aに代えて(14b)で得た発光偏光素子Dを用いた点以外は、実施例7と同様にして光学積層体を作製した。
(21a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例13に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
発光偏光素子Aに代えて(13b)で得た発光偏光素子Cを用いた点、及び光反射層R640に代えて(3c)で得た光反射層RVISを用いた点以外は、実施例7と同様にして光学積層体を作製した。
(22a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例14に記載されている発光偏光素子と同じである。
実施例3に記載されている光反射層と同じである。
発光偏光素子Aに代えて(14b)で得た発光偏光素子Dを用いた点、及び光反射層R640に代えて(3c)で得た光反射層RVISを用いた点以外は、実施例7と同様にして光学積層体を作製した。
(23a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例13に記載されている発光偏光素子と同じである。
実施例5に記載されている光反射層と同じである。
発光偏光素子Aに代えて(13b)で得た発光偏光素子Cを用いた点以外は、実施例11と同様にして光学積層体を作製した。
(24a)非発光偏光素子の作製
実施例1に記載されている非発光偏光素子と同じである。
実施例14に記載されている発光偏光素子と同じである。
実施例5に記載されている光反射層と同じである。
発光偏光素子Aに代えて(14b)で得た発光偏光素子Dを用いた点以外は、実施例11と同様にして光学積層体を作製した。
発光偏光素子Aを用いなかった点以外は、実施例1と同じ方法で各部材を積層し、図7に示す光学積層体300(TAC支持体22/光反射層R11/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
発光偏光素子Bを用いなかった点以外は、実施例2と同じ方法で各部材を積層し、図7に示す光学積層体300(TAC支持体22/光反射層R11/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
発光偏光素子Aを用いなかった点以外は、実施例3と同じ方法で各部材を積層し、図7に示す光学積層体300(TAC支持体22/光反射層R11/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
発光偏光素子Aを用いなかった点以外は、実施例5と同じ方法で各部材を積層し、図8に示す光学積層体310(TAC支持体22/光反射層L12/光反射層R11/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
発光偏光素子Bを用いなかった点以外は、実施例6と同じ方法で各部材を積層し、図8に示す光学積層体310(TAC支持体22/光反射層L12/光反射層R11/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
光反射層R640を用いなかった点以外は、実施例1と同じ方法で各部材を積層し、図9に示す光学積層体320(TAC支持体22/発光偏光素子31/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
光反射層R460を用いなかった点以外は、実施例2と同じ方法で各部材を積層し、図9に示す光学積層体320(TAC支持体22/発光偏光素子31/非発光偏光素子41/PC支持体23)の構成を有する光学積層体を作製した。
光反射層R640を用いなかった点以外は、実施例13と同じ方法で各部材を積層し、図9に示す光学積層体320(TAC支持体22/発光偏光素子31/非発光偏光素子32/PC支持体23)の構成を有する光学積層体を作製した。
光反射層R640を用いなかった点以外は、実施例14と同じ方法で各部材を積層し、図9に示す光学積層体320(TAC支持体22/発光偏光素子31/非発光偏光素子32/PC支持体23)の構成を有する光学積層体を作製した。
実施例1~24及び比較例1~9で作製した各光学積層体の評価は、以下に示した判定基準に基づいて、屋外及び屋内のそれぞれの環境下で各光学積層体の外観を目視で観察した。ここで、屋外とは日中の晴天で太陽光が十分に降り注ぐ条件(=紫外光を含む条件)であり、屋内とは白色蛍光灯を点灯した日中の室内条件(=紫外光を含まない条件)である。なお、後者の場合は、屋外において紫外光が少ない曇天等の天候条件にも相当する。評価に当たっては、各光学積層体のTAC側を光源側に向け設置し、正面方向及び上下及び左右の斜め方向(35度~45度程度)から観察した。表1は、実施例1~24で作製した各光学積層体の評価を示し、表2は、比較例1~9で作製した各光学積層体の評価を示す。表1、2において、光学積層体は、左側(TAC側)が外光入射側となるように構成されている。また、表1、2中、灰色は、非発光偏光素子のそのものの色相を示す。
5:発光偏光素子の発光色と光反射層の反射色が合わさり相乗効果が得られている。
4:発光偏光素子の発光色と光反射層の反射色が合わさっているが、支持体を除く最表面に位置する層(部材)の色がより強く観察される。
3:発光偏光素子の発光色と光反射層の反射色が合わさっているが、支持体を除く最表面の次に位置する層(部材)の色がより強く観察される。
2:発光偏光素子の発光色のみが観察される。
1:光反射層の反射色のみが観察される。
A1:光反射層の反射色のみが観察される。
A2:非発光偏光素子自体の色が観察される。
B:発光偏光素子自体の色と光反射層の反射色が合わさって観察される。
C:発光偏光素子自体の色のみが観察される。
D:発光偏光素子自体の色と非発光偏光素子自体の色が合わさって観察される。
11 コレステリック液晶層R体、R体、光反射層R
12 コレステリック液晶層L体、L体、光反射層L
22 TAC支持体
23 PC支持体
30、31 発光偏光素子
40、41 非発光偏光素子
100、200、210、220、300、310、320 光学積層体
Claims (7)
- 少なくとも1つの光反射層と、発光偏光素子と、非発光偏光素子とを含む光学積層体であって、
前記光反射層は、可視光域に反射特性を有し、
前記発光偏光素子は、紫外光線の照射により発光し、当該発光は可視光域に少なくとも一つの極大発光波長を有し、
前記非発光偏光素子は、吸収型偏光素子及び/又は反射型偏光素子であり、
前記発光偏光素子の配向軸と前記非発光偏光素子の配向軸は、互いに平行又は略平行に配置され、
外光入射側から、前記光反射層、前記発光偏光素子、前記非発光偏光素子の順、又は前記発光偏光素子、前記光反射層、前記非発光偏光素子の順に配置されていることを特徴とする光学積層体。 - 前記光反射層は、少なくとも一層のコレステリック液晶層を備える請求項1に記載の光学積層体。
- 前記光反射層の反射特性及び前記発光偏光素子の発光色が以下の(1)~(20)から選択される請求項1又は2に記載の光学積層体。
(1)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が青色である。
(2)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が黄色である。
(3)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が緑色である。
(4)前記光反射層は、波長400~500nmに極大反射率を有し、前記発光偏光素子の発光色が青緑色である。
(5)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が青色である。
(6)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が黄色である。
(7)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が緑色である。
(8)前記光反射層は、波長500~600nmに極大反射率を有し、前記発光偏光素子の発光色が青緑色である。
(9)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が青色である。
(10)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が黄色である。
(11)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が緑色である。
(12)前記光反射層は、波長600~700nmに極大反射率を有し、前記発光偏光素子の発光色が青緑色である。
(13)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青色である。
(14)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が黄色である。
(15)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が緑色である。
(16)前記光反射層は、波長400~700nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青緑色である。
(17)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青色である。
(18)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が黄色である。
(19)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が緑色である。
(20)前記光反射層は、波長400~900nmに亘って反射帯域を有し、前記発光偏光素子の発光色が青緑色である。 - 外光入射側から前記光反射層、前記発光偏光素子、及び前記非発光偏光素子をこの順に備える、請求項1乃至3までのいずれか1項に記載の光学積層体。
- 外光入射側から前記発光偏光素子、前記光反射層、及び前記非発光偏光素子をこの順に備える、請求項1乃至3までのいずれか1項に記載の光学積層体。
- 請求項1乃至5までのいずれか1項に記載の光学積層体を備える偏光レンズ。
- 請求項6に記載の偏光レンズを備え、前記非発光偏光素子が視認側に配置されるアイウェア。
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WO2016002582A1 (ja) * | 2014-07-01 | 2016-01-07 | 日本化薬株式会社 | 光学フィルムおよびこれを用いた光学積層体 |
WO2017175829A1 (ja) * | 2016-04-08 | 2017-10-12 | 日本化薬株式会社 | アイウェア用光学フィルム、並びにこれを用いた光学積層体およびアイウェア |
EP3567088A1 (en) * | 2018-05-11 | 2019-11-13 | Université de Genève | Functionalized polyether macrocyclic compounds and use thereof as luminescent markers |
WO2020235413A1 (ja) * | 2019-05-17 | 2020-11-26 | 株式会社ポラテクノ | 光学素子又は偏光板及びこれらを用いたアイウェア |
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JP2002502051A (ja) * | 1998-01-29 | 2002-01-22 | ランドクォート | 効率的なフォトルミネッセンス偏光子、その形成方法及び表示装置への利用 |
WO2016002582A1 (ja) * | 2014-07-01 | 2016-01-07 | 日本化薬株式会社 | 光学フィルムおよびこれを用いた光学積層体 |
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EP3567088A1 (en) * | 2018-05-11 | 2019-11-13 | Université de Genève | Functionalized polyether macrocyclic compounds and use thereof as luminescent markers |
WO2020235413A1 (ja) * | 2019-05-17 | 2020-11-26 | 株式会社ポラテクノ | 光学素子又は偏光板及びこれらを用いたアイウェア |
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